28056311538 has 16 divisors (see below), whose sum is σ = 56116196256. Its totient is φ = 9351508320.

The previous prime is 28056311537. The next prime is 28056311597. The reversal of 28056311538 is 83511365082.

It is a self number, because there is not a number n which added to its sum of digits gives 28056311538.

It is not an unprimeable number, because it can be changed into a prime (28056311531) 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, 40768 + ... + 240363.

It is an arithmetic number, because the mean of its divisors is an integer number (3507262266).

Almost surely, 2^28056311538 is an apocalyptic number.

28056311538 is an abundant number, since it is smaller than the sum of its proper divisors (28059884718).

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

28056311538 is a wasteful number, since it uses less digits than its factorization.

28056311538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297769.

The product of its (nonzero) digits is 172800, while the sum is 42.

The spelling of 28056311538 in words is "twenty-eight billion, fifty-six million, three hundred eleven thousand, five hundred thirty-eight".