228221004 has 36 divisors (see below), whose sum is σ = 585330872. Its totient is φ = 69157440.

The previous prime is 228220957. The next prime is 228221023. The reversal of 228221004 is 400122822.

It is a happy number.

228221004 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77137 + ... + 80040.

Almost surely, 2^228221004 is an apocalyptic number.

It is an amenable number.

228221004 is an abundant number, since it is smaller than the sum of its proper divisors (357109868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

228221004 is a wasteful number, since it uses less digits than its factorization.

228221004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157206 (or 157193 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 228221004 is about 15106.9852717212. The cubic root of 228221004 is about 611.1087993987.

Adding to 228221004 its reverse (400122822), we get a palindrome (628343826).

The spelling of 228221004 in words is "two hundred twenty-eight million, two hundred twenty-one thousand, four".