57138887 has 16 divisors (see below), whose sum is σ = 66552192. Its totient is φ = 48576000.

The previous prime is 57138857. The next prime is 57138899. The reversal of 57138887 is 78883175.

It is a cyclic number.

It is not a de Polignac number, because 57138887 - 2¹⁴ = 57122503 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57138827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7637 + ... + 13137.

It is an arithmetic number, because the mean of its divisors is an integer number (4159512).

Almost surely, 2^57138887 is an apocalyptic number.

57138887 is a deficient number, since it is larger than the sum of its proper divisors (9413305).

57138887 is a wasteful number, since it uses less digits than its factorization.

57138887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5578.

The product of its digits is 376320, while the sum is 47.

The square root of 57138887 is about 7559.0268553564. The cubic root of 57138887 is about 385.1624366566.

The spelling of 57138887 in words is "fifty-seven million, one hundred thirty-eight thousand, eight hundred eighty-seven".