15120228 has 12 divisors (see below), whose sum is σ = 35280560. Its totient is φ = 5040072.

The previous prime is 15120227. The next prime is 15120233. The reversal of 15120228 is 82202151.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (15120227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 629998 + ... + 630021.

Almost surely, 2^15120228 is an apocalyptic number.

It is an amenable number.

15120228 is an abundant number, since it is smaller than the sum of its proper divisors (20160332).

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

15120228 is a wasteful number, since it uses less digits than its factorization.

15120228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260026 (or 1260024 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 15120228 is about 3888.4737365707. The cubic root of 15120228 is about 247.2783609096.

Adding to 15120228 its reverse (82202151), we get a palindrome (97322379).

The spelling of 15120228 in words is "fifteen million, one hundred twenty thousand, two hundred twenty-eight".