28711656 has 48 divisors (see below), whose sum is σ = 78083460. Its totient is φ = 9530880.

The previous prime is 28711651. The next prime is 28711687. The reversal of 28711656 is 65611782.

It can be written as a sum of positive squares in 2 ways, for example, as 28451556 + 260100 = 5334^2 + 510^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 28711656.

It is not an unprimeable number, because it can be changed into a prime (28711651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20416 + ... + 21776.

Almost surely, 2^28711656 is an apocalyptic number.

It is an amenable number.

28711656 is an abundant number, since it is smaller than the sum of its proper divisors (49371804).

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

28711656 is a wasteful number, since it uses less digits than its factorization.

28711656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1666 (or 1659 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 28711656 is about 5358.3258579523. The cubic root of 28711656 is about 306.2100313798.

The spelling of 28711656 in words is "twenty-eight million, seven hundred eleven thousand, six hundred fifty-six".