28917056 has 42 divisors (see below), whose sum is σ = 66758058. Its totient is φ = 12391680.

The previous prime is 28917047. The next prime is 28917059. The reversal of 28917056 is 65071982.

It can be written as a sum of positive squares in only one way, i.e., 28302400 + 614656 = 5320^2 + 784^2 .

It is a super-2 number, since 2×28917056² = 1672392255414272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28917059) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1475 + ... + 7746.

Almost surely, 2^28917056 is an apocalyptic number.

It is an amenable number.

28917056 is an abundant number, since it is smaller than the sum of its proper divisors (37841002).

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

28917056 is an equidigital number, since it uses as much as digits as its factorization.

28917056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9247 (or 9230 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 28917056 is about 5377.4581355879. The cubic root of 28917056 is about 306.9384945416.

The spelling of 28917056 in words is "twenty-eight million, nine hundred seventeen thousand, fifty-six".