57115520 has 256 divisors, whose sum is σ = 182131200. Its totient is φ = 16588800.

The previous prime is 57115519. The next prime is 57115543. The reversal of 57115520 is 2551175.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 57115520.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 936290 + ... + 936350.

It is an arithmetic number, because the mean of its divisors is an integer number (711450).

Almost surely, 2^57115520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57115520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91065600).

57115520 is an abundant number, since it is smaller than the sum of its proper divisors (125015680).

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

57115520 is a wasteful number, since it uses less digits than its factorization.

57115520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117 (or 105 counting only the distinct ones).

The product of its (nonzero) digits is 1750, while the sum is 26.

The square root of 57115520 is about 7557.4810618354. The cubic root of 57115520 is about 385.1099253211.

Adding to 57115520 its reverse (2551175), we get a palindrome (59666695).

It can be divided in two parts, 571155 and 20, that added together give a palindrome (571175).

The spelling of 57115520 in words is "fifty-seven million, one hundred fifteen thousand, five hundred twenty".