57131540 has 24 divisors (see below), whose sum is σ = 125193600. Its totient is φ = 21858848.

The previous prime is 57131533. The next prime is 57131549. The reversal of 57131540 is 4513175.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57131549) 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, 61640 + ... + 62559.

It is an arithmetic number, because the mean of its divisors is an integer number (5216400).

Almost surely, 2^57131540 is an apocalyptic number.

It is an amenable number.

57131540 is an abundant number, since it is smaller than the sum of its proper divisors (68062060).

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

57131540 is a wasteful number, since it uses less digits than its factorization.

57131540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124231 (or 124229 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 57131540 is about 7558.5408644791. The cubic root of 57131540 is about 385.1459277029.

The spelling of 57131540 in words is "fifty-seven million, one hundred thirty-one thousand, five hundred forty".