28567720775 has 24 divisors (see below), whose sum is σ = 38668191744. Its totient is φ = 20763698400.

The previous prime is 28567720759. The next prime is 28567720787. The reversal of 28567720775 is 57702776582.

It is not a de Polignac number, because 28567720775 - 2⁴ = 28567720759 is a prime.

It is a super-2 number, since 2×28567720775² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28567720775.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 426092 + ... + 488558.

It is an arithmetic number, because the mean of its divisors is an integer number (1611174656).

Almost surely, 2^28567720775 is an apocalyptic number.

28567720775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28567720775 is a deficient number, since it is larger than the sum of its proper divisors (10100470969).

28567720775 is a wasteful number, since it uses less digits than its factorization.

28567720775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64151 (or 64146 counting only the distinct ones).

The product of its (nonzero) digits is 11524800, while the sum is 56.

The spelling of 28567720775 in words is "twenty-eight billion, five hundred sixty-seven million, seven hundred twenty thousand, seven hundred seventy-five".