57131780 has 24 divisors (see below), whose sum is σ = 120845760. Its totient is φ = 22687200.

The previous prime is 57131749. The next prime is 57131801. The reversal of 57131780 is 8713175.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7496 + ... + 13055.

It is an arithmetic number, because the mean of its divisors is an integer number (5035240).

Almost surely, 2^57131780 is an apocalyptic number.

It is an amenable number.

57131780 is an abundant number, since it is smaller than the sum of its proper divisors (63713980).

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

57131780 is a wasteful number, since it uses less digits than its factorization.

57131780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20699 (or 20697 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 32.

The square root of 57131780 is about 7558.5567405425. The cubic root of 57131780 is about 385.1464670133.

The spelling of 57131780 in words is "fifty-seven million, one hundred thirty-one thousand, seven hundred eighty".