28870524 has 18 divisors (see below), whose sum is σ = 72978360. Its totient is φ = 9623496.

The previous prime is 28870511. The next prime is 28870553. The reversal of 28870524 is 42507882.

It is a happy number.

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: 801959 = 28870524 / (2 + 8 + 8 + 7 + 0 + 5 + 2 + 4).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 400944 + ... + 401015.

Almost surely, 2^28870524 is an apocalyptic number.

It is an amenable number.

28870524 is an abundant number, since it is smaller than the sum of its proper divisors (44107836).

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

28870524 is a wasteful number, since it uses less digits than its factorization.

28870524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801969 (or 801964 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 28870524 is about 5373.1298141772. The cubic root of 28870524 is about 306.7737690387.

The spelling of 28870524 in words is "twenty-eight million, eight hundred seventy thousand, five hundred twenty-four".