diff --git a/fems-api/src/models/Company.js b/fems-api/src/models/Company.js
index 4473fe3..e6b97e6 100644
--- a/fems-api/src/models/Company.js
+++ b/fems-api/src/models/Company.js
@@ -15,7 +15,7 @@ class Company extends Model {
           allowNull: false,
         },
         businessNumber: {
-          type: DataTypes.STRING(20),
+          type: DataTypes.BIGINT,
           allowNull: false,
           unique: true,
         },
diff --git a/fems-api/src/utils/createInitialAdmin.js b/fems-api/src/utils/createInitialAdmin.js
index 1c7da05..64f1828 100644
--- a/fems-api/src/utils/createInitialAdmin.js
+++ b/fems-api/src/utils/createInitialAdmin.js
@@ -21,7 +21,7 @@ async function createInitialAdmin() {
     if (!adminCompany) {
       adminCompany = await Company.create({
         name: "FEMS 관리자",
-        businessNumber: "439-78-02852",
+        businessNumber: 4397802852,
         address: "서울시 강남구",
         tel: "02-0000-0000",
         email: "admin@fems.com",