57478440 has 64 divisors (see below), whose sum is σ = 173093760. Its totient is φ = 15269120.

The previous prime is 57478423. The next prime is 57478441. The reversal of 57478440 is 4487475.

It is not an unprimeable number, because it can be changed into a prime (57478441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37285 + ... + 38795.

It is an arithmetic number, because the mean of its divisors is an integer number (2704590).

Almost surely, 2^57478440 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 57478440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86546880).

57478440 is an abundant number, since it is smaller than the sum of its proper divisors (115615320).

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

57478440 is a wasteful number, since it uses less digits than its factorization.

57478440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1842 (or 1838 counting only the distinct ones).

The product of its (nonzero) digits is 125440, while the sum is 39.

The square root of 57478440 is about 7581.4536864641. The cubic root of 57478440 is about 385.9238845148.

The spelling of 57478440 in words is "fifty-seven million, four hundred seventy-eight thousand, four hundred forty".