57115720 has 16 divisors (see below), whose sum is σ = 128510460. Its totient is φ = 22846272.

The previous prime is 57115649. The next prime is 57115741. The reversal of 57115720 is 2751175.

It can be written as a sum of positive squares in 2 ways, for example, as 51926436 + 5189284 = 7206^2 + 2278^2 .

It is a super-2 number, since 2×57115720² = 6524410942236800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 713907 + ... + 713986.

Almost surely, 2^57115720 is an apocalyptic number.

It is an amenable number.

57115720 is an abundant number, since it is smaller than the sum of its proper divisors (71394740).

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

57115720 is a wasteful number, since it uses less digits than its factorization.

57115720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1427904 (or 1427900 counting only the distinct ones).

The product of its (nonzero) digits is 2450, while the sum is 28.

The square root of 57115720 is about 7557.4942937458. The cubic root of 57115720 is about 385.1103748305.

Adding to 57115720 its reverse (2751175), we get a palindrome (59866895).

The spelling of 57115720 in words is "fifty-seven million, one hundred fifteen thousand, seven hundred twenty".