57115820 has 12 divisors (see below), whose sum is σ = 119943264. Its totient is φ = 22846320.

The previous prime is 57115813. The next prime is 57115859. The reversal of 57115820 is 2851175.

57115820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1427876 + ... + 1427915.

It is an arithmetic number, because the mean of its divisors is an integer number (9995272).

Almost surely, 2^57115820 is an apocalyptic number.

It is an amenable number.

57115820 is an abundant number, since it is smaller than the sum of its proper divisors (62827444).

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

57115820 is a wasteful number, since it uses less digits than its factorization.

57115820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2855800 (or 2855798 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 29.

The square root of 57115820 is about 7557.5009096923. The cubic root of 57115820 is about 385.1105995848.

Adding to 57115820 its reverse (2851175), we get a palindrome (59966995).

The spelling of 57115820 in words is "fifty-seven million, one hundred fifteen thousand, eight hundred twenty".