28057188 has 24 divisors (see below), whose sum is σ = 66445792. Its totient is φ = 9212544.

The previous prime is 28057177. The next prime is 28057223. The reversal of 28057188 is 88175082.

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, 16645 + ... + 18252.

Almost surely, 2^28057188 is an apocalyptic number.

It is an amenable number.

28057188 is an abundant number, since it is smaller than the sum of its proper divisors (38388604).

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

28057188 is a wasteful number, since it uses less digits than its factorization.

28057188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34971 (or 34969 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 39.

The square root of 28057188 is about 5296.9036238165. The cubic root of 28057188 is about 303.8654904699.

The spelling of 28057188 in words is "twenty-eight million, fifty-seven thousand, one hundred eighty-eight".