28056311572 has 12 divisors (see below), whose sum is σ = 49172829076. Its totient is φ = 14006931840.

The previous prime is 28056311537. The next prime is 28056311597. The reversal of 28056311572 is 27511365082.

It can be written as a sum of positive squares in 2 ways, for example, as 19189452676 + 8866858896 = 138526^2 + 94164^2 .

It is a super-2 number, since 2×28056311572² (a number of 22 digits) contains 22 as substring.

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, 5303013 + ... + 5308300.

Almost surely, 2^28056311572 is an apocalyptic number.

It is an amenable number.

28056311572 is a deficient number, since it is larger than the sum of its proper divisors (21116517504).

28056311572 is a wasteful number, since it uses less digits than its factorization.

28056311572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10611978 (or 10611976 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 40.

The spelling of 28056311572 in words is "twenty-eight billion, fifty-six million, three hundred eleven thousand, five hundred seventy-two".