28551172 has 24 divisors (see below), whose sum is σ = 54696152. Its totient is φ = 12960000.

The previous prime is 28551169. The next prime is 28551181. The reversal of 28551172 is 27115582.

It can be written as a sum of positive squares in 4 ways, for example, as 2172676 + 26378496 = 1474^2 + 5136^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1329 + ... + 7672.

Almost surely, 2^28551172 is an apocalyptic number.

It is an amenable number.

28551172 is a deficient number, since it is larger than the sum of its proper divisors (26144980).

28551172 is a wasteful number, since it uses less digits than its factorization.

28551172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9079 (or 9077 counting only the distinct ones).

The product of its digits is 5600, while the sum is 31.

The square root of 28551172 is about 5343.3296735275. The cubic root of 28551172 is about 305.6384440594.

The spelling of 28551172 in words is "twenty-eight million, five hundred fifty-one thousand, one hundred seventy-two".