28056311571 has 8 divisors (see below), whose sum is σ = 37411931584. Its totient is φ = 18702449640.

The previous prime is 28056311537. The next prime is 28056311597. The reversal of 28056311571 is 17511365082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-28056311571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28056311501) 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, 401821 + ... + 466446.

It is an arithmetic number, because the mean of its divisors is an integer number (4676491448).

Almost surely, 2^28056311571 is an apocalyptic number.

28056311571 is a deficient number, since it is larger than the sum of its proper divisors (9355620013).

28056311571 is a wasteful number, since it uses less digits than its factorization.

28056311571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879041.

The product of its (nonzero) digits is 50400, while the sum is 39.

The spelling of 28056311571 in words is "twenty-eight billion, fifty-six million, three hundred eleven thousand, five hundred seventy-one".