57138873 has 32 divisors (see below), whose sum is σ = 86456832. Its totient is φ = 33264000.

The previous prime is 57138857. The next prime is 57138899. The reversal of 57138873 is 37883175.

It is not a de Polignac number, because 57138873 - 2⁴ = 57138857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (57138803) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 94773 + ... + 95373.

It is an arithmetic number, because the mean of its divisors is an integer number (2701776).

Almost surely, 2^57138873 is an apocalyptic number.

It is an amenable number.

57138873 is a deficient number, since it is larger than the sum of its proper divisors (29317959).

57138873 is a wasteful number, since it uses less digits than its factorization.

57138873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725.

The product of its digits is 141120, while the sum is 42.

The square root of 57138873 is about 7559.0259293113. The cubic root of 57138873 is about 385.1624051995.

It can be divided in two parts, 5713887 and 3, that added together give a triangular number (5713890 = T₃₃₈₀).

The spelling of 57138873 in words is "fifty-seven million, one hundred thirty-eight thousand, eight hundred seventy-three".