38857500891 has 18 divisors (see below), whose sum is σ = 61693866780. Its totient is φ = 23549999880.

The previous prime is 38857500887. The next prime is 38857500911. The reversal of 38857500891 is 19800575883.

38857500891 is a `hidden beast` number, since 3 + 8 + 8 + 57 + 500 + 89 + 1 = 666.

It is not a de Polignac number, because 38857500891 - 2² = 38857500887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (38857500091) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 17839821 + ... + 17841998.

Almost surely, 2^38857500891 is an apocalyptic number.

38857500891 is a deficient number, since it is larger than the sum of its proper divisors (22836365889).

38857500891 is a wasteful number, since it uses less digits than its factorization.

38857500891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35681847 (or 35681833 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 54.

The spelling of 38857500891 in words is "thirty-eight billion, eight hundred fifty-seven million, five hundred thousand, eight hundred ninety-one".