57287280 has 160 divisors (see below), whose sum is σ = 198201600. Its totient is φ = 13602816.

The previous prime is 57287257. The next prime is 57287281. The reversal of 57287280 is 8278275.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57287281) by changing a digit.

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, 77151 + ... + 77889.

It is an arithmetic number, because the mean of its divisors is an integer number (1238760).

Almost surely, 2^57287280 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 57287280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99100800).

57287280 is an abundant number, since it is smaller than the sum of its proper divisors (140914320).

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

57287280 is a wasteful number, since it uses less digits than its factorization.

57287280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791 (or 785 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 39.

The square root of 57287280 is about 7568.8361060337. The cubic root of 57287280 is about 385.4955781480.

The spelling of 57287280 in words is "fifty-seven million, two hundred eighty-seven thousand, two hundred eighty".