28704972 has 24 divisors (see below), whose sum is σ = 70504000. Its totient is φ = 9064656.

The previous prime is 28704947. The next prime is 28704979. The reversal of 28704972 is 27940782.

It is a self number, because there is not a number n which added to its sum of digits gives 28704972.

It is not an unprimeable number, because it can be changed into a prime (28704979) 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, 62722 + ... + 63177.

Almost surely, 2^28704972 is an apocalyptic number.

It is an amenable number.

28704972 is an abundant number, since it is smaller than the sum of its proper divisors (41799028).

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

28704972 is a wasteful number, since it uses less digits than its factorization.

28704972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125925 (or 125923 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 28704972 is about 5357.7021193792. The cubic root of 28704972 is about 306.1862678986.

The spelling of 28704972 in words is "twenty-eight million, seven hundred four thousand, nine hundred seventy-two".