28957972 has 12 divisors (see below), whose sum is σ = 51912756. Its totient is φ = 14125760.

The previous prime is 28957961. The next prime is 28957991. The reversal of 28957972 is 27975982.

It can be written as a sum of positive squares in 2 ways, for example, as 14714896 + 14243076 = 3836^2 + 3774^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88123 + ... + 88450.

It is an arithmetic number, because the mean of its divisors is an integer number (4326063).

Almost surely, 2^28957972 is an apocalyptic number.

It is an amenable number.

28957972 is a deficient number, since it is larger than the sum of its proper divisors (22954784).

28957972 is a wasteful number, since it uses less digits than its factorization.

28957972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176618 (or 176616 counting only the distinct ones).

The product of its digits is 635040, while the sum is 49.

The square root of 28957972 is about 5381.2611904646. The cubic root of 28957972 is about 307.0831931907.

It can be divided in two parts, 28957 and 972, that added together give a square (29929 = 173²).

The spelling of 28957972 in words is "twenty-eight million, nine hundred fifty-seven thousand, nine hundred seventy-two".