57557780 has 24 divisors (see below), whose sum is σ = 138139008. Its totient is φ = 19734048.

The previous prime is 57557771. The next prime is 57557791. The reversal of 57557780 is 8775575.

It is a congruent number.

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, 205424 + ... + 205703.

It is an arithmetic number, because the mean of its divisors is an integer number (5755792).

Almost surely, 2^57557780 is an apocalyptic number.

It is an amenable number.

57557780 is an abundant number, since it is smaller than the sum of its proper divisors (80581228).

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

57557780 is a wasteful number, since it uses less digits than its factorization.

57557780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411143 (or 411141 counting only the distinct ones).

The product of its (nonzero) digits is 343000, while the sum is 44.

The square root of 57557780 is about 7586.6843877942. The cubic root of 57557780 is about 386.1013720704.

The spelling of 57557780 in words is "fifty-seven million, five hundred fifty-seven thousand, seven hundred eighty".