15225228 has 18 divisors (see below), whose sum is σ = 38486084. Its totient is φ = 5075064.

The previous prime is 15225181. The next prime is 15225233. The reversal of 15225228 is 82252251.

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 211426 + ... + 211497.

Almost surely, 2^15225228 is an apocalyptic number.

15225228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

15225228 is an abundant number, since it is smaller than the sum of its proper divisors (23260856).

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

15225228 is a wasteful number, since it uses less digits than its factorization.

15225228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422933 (or 422928 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 15225228 is about 3901.9518192822. The cubic root of 15225228 is about 247.8494360112.

Adding to 15225228 its reverse (82252251), we get a palindrome (97477479).

The spelling of 15225228 in words is "fifteen million, two hundred twenty-five thousand, two hundred twenty-eight".