57120813 has 24 divisors (see below), whose sum is σ = 85305792. Its totient is φ = 36808128.

The previous prime is 57120809. The next prime is 57120829. The reversal of 57120813 is 31802175.

It is not a de Polignac number, because 57120813 - 2² = 57120809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57120883) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39145 + ... + 40577.

It is an arithmetic number, because the mean of its divisors is an integer number (3554408).

Almost surely, 2^57120813 is an apocalyptic number.

It is an amenable number.

57120813 is a deficient number, since it is larger than the sum of its proper divisors (28184979).

57120813 is a wasteful number, since it uses less digits than its factorization.

57120813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1585 (or 1582 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 57120813 is about 7557.8312365387. The cubic root of 57120813 is about 385.1218212346.

Adding to 57120813 its reverse (31802175), we get a palindrome (88922988).

The spelling of 57120813 in words is "fifty-seven million, one hundred twenty thousand, eight hundred thirteen".