28504974979 has 24 divisors (see below), whose sum is σ = 32634843840. Its totient is φ = 24816980448.

The previous prime is 28504974943. The next prime is 28504974989. The reversal of 28504974979 is 97947940582.

It is not a de Polignac number, because 28504974979 - 2¹¹ = 28504972931 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28504974979.

It is not an unprimeable number, because it can be changed into a prime (28504974989) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 709344 + ... + 748450.

It is an arithmetic number, because the mean of its divisors is an integer number (1359785160).

Almost surely, 2^28504974979 is an apocalyptic number.

28504974979 is a deficient number, since it is larger than the sum of its proper divisors (4129868861).

28504974979 is a wasteful number, since it uses less digits than its factorization.

28504974979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39379 (or 39366 counting only the distinct ones).

The product of its (nonzero) digits is 45722880, while the sum is 64.

The spelling of 28504974979 in words is "twenty-eight billion, five hundred four million, nine hundred seventy-four thousand, nine hundred seventy-nine".