28157386572 has 36 divisors (see below), whose sum is σ = 81343561936. Its totient is φ = 8044967520.

The previous prime is 28157386571. The next prime is 28157386591. The reversal of 28157386572 is 27568375182.

28157386572 is a `hidden beast` number, since 2 + 8 + 1 + 573 + 8 + 65 + 7 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×28157386572² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28157386571) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55867579 + ... + 55868082.

Almost surely, 2^28157386572 is an apocalyptic number.

It is an amenable number.

28157386572 is an abundant number, since it is smaller than the sum of its proper divisors (53186175364).

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

28157386572 is a wasteful number, since it uses less digits than its factorization.

28157386572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111735678 (or 111735673 counting only the distinct ones).

The product of its digits is 5644800, while the sum is 54.

The spelling of 28157386572 in words is "twenty-eight billion, one hundred fifty-seven million, three hundred eighty-six thousand, five hundred seventy-two".