57642820 has 12 divisors (see below), whose sum is σ = 121049964. Its totient is φ = 23057120.

The previous prime is 57642803. The next prime is 57642863. The reversal of 57642820 is 2824675.

It can be written as a sum of positive squares in 2 ways, for example, as 21233664 + 36409156 = 4608^2 + 6034^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1441051 + ... + 1441090.

It is an arithmetic number, because the mean of its divisors is an integer number (10087497).

Almost surely, 2^57642820 is an apocalyptic number.

It is an amenable number.

57642820 is an abundant number, since it is smaller than the sum of its proper divisors (63407144).

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

57642820 is a wasteful number, since it uses less digits than its factorization.

57642820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2882150 (or 2882148 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 57642820 is about 7592.2868755073. The cubic root of 57642820 is about 386.2914298030.

The spelling of 57642820 in words is "fifty-seven million, six hundred forty-two thousand, eight hundred twenty".