57278464 has 72 divisors (see below), whose sum is σ = 125828640. Its totient is φ = 25952256.

The previous prime is 57278461. The next prime is 57278471. The reversal of 57278464 is 46487275.

It is a self number, because there is not a number n which added to its sum of digits gives 57278464.

It is not an unprimeable number, because it can be changed into a prime (57278461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2490357 + ... + 2490379.

It is an arithmetic number, because the mean of its divisors is an integer number (1747620).

Almost surely, 2^57278464 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 57278464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62914320).

57278464 is an abundant number, since it is smaller than the sum of its proper divisors (68550176).

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

57278464 is an frugal number, since it uses more digits than its factorization.

57278464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76 (or 44 counting only the distinct ones).

The product of its digits is 376320, while the sum is 43.

The square root of 57278464 is about 7568.2536955364. The cubic root of 57278464 is about 385.4758023596.

The spelling of 57278464 in words is "fifty-seven million, two hundred seventy-eight thousand, four hundred sixty-four".