57820840 has 64 divisors (see below), whose sum is σ = 162207360. Its totient is φ = 18021120.

The previous prime is 57820837. The next prime is 57820849. The reversal of 57820840 is 4802875.

It is a junction number, because it is equal to n+sod(n) for n = 57820796 and 57820805.

It is not an unprimeable number, because it can be changed into a prime (57820849) 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, 6307 + ... + 12466.

It is an arithmetic number, because the mean of its divisors is an integer number (2534490).

Almost surely, 2^57820840 is an apocalyptic number.

It is an amenable number.

57820840 is an abundant number, since it is smaller than the sum of its proper divisors (104386520).

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

57820840 is a wasteful number, since it uses less digits than its factorization.

57820840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18802 (or 18798 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 57820840 is about 7604.0015781166. The cubic root of 57820840 is about 386.6886861552.

The spelling of 57820840 in words is "fifty-seven million, eight hundred twenty thousand, eight hundred forty".