28257008 has 20 divisors (see below), whose sum is σ = 58959768. Its totient is φ = 13041600.

The previous prime is 28257007. The next prime is 28257013. The reversal of 28257008 is 80075282.

It is a super-2 number, since 2×28257008² = 1596917002224128, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28257007) 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, 67718 + ... + 68133.

Almost surely, 2^28257008 is an apocalyptic number.

It is an amenable number.

28257008 is an abundant number, since it is smaller than the sum of its proper divisors (30702760).

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

28257008 is a wasteful number, since it uses less digits than its factorization.

28257008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135872 (or 135866 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 28257008 is about 5315.7321226713. The cubic root of 28257008 is about 304.5851495084.

The spelling of 28257008 in words is "twenty-eight million, two hundred fifty-seven thousand, eight".