28917156 has 24 divisors (see below), whose sum is σ = 69043744. Its totient is φ = 9414720.

The previous prime is 28917151. The next prime is 28917179. The reversal of 28917156 is 65171982.

It is a super-3 number, since 3×28917156³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (28917151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27505 + ... + 28536.

Almost surely, 2^28917156 is an apocalyptic number.

It is an amenable number.

28917156 is an abundant number, since it is smaller than the sum of its proper divisors (40126588).

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

28917156 is a wasteful number, since it uses less digits than its factorization.

28917156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56091 (or 56089 counting only the distinct ones).

The product of its digits is 30240, while the sum is 39.

The square root of 28917156 is about 5377.4674336531. The cubic root of 28917156 is about 306.9388483560.

The spelling of 28917156 in words is "twenty-eight million, nine hundred seventeen thousand, one hundred fifty-six".