28156932 has 18 divisors (see below), whose sum is σ = 71174558. Its totient is φ = 9385632.

The previous prime is 28156927. The next prime is 28156937. The reversal of 28156932 is 23965182.

It is an interprime number because it is at equal distance from previous prime (28156927) and next prime (28156937).

It can be written as a sum of positive squares in only one way, i.e., 23970816 + 4186116 = 4896^2 + 2046^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 782137 = 28156932 / (2 + 8 + 1 + 5 + 6 + 9 + 3 + 2).

It is not an unprimeable number, because it can be changed into a prime (28156937) 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, 391033 + ... + 391104.

Almost surely, 2^28156932 is an apocalyptic number.

It is an amenable number.

28156932 is an abundant number, since it is smaller than the sum of its proper divisors (43017626).

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

28156932 is a wasteful number, since it uses less digits than its factorization.

28156932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782147 (or 782142 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 28156932 is about 5306.3105826930. The cubic root of 28156932 is about 304.2251477303.

The spelling of 28156932 in words is "twenty-eight million, one hundred fifty-six thousand, nine hundred thirty-two".