57085440 has 80 divisors (see below), whose sum is σ = 182519568. Its totient is φ = 15220736.

The previous prime is 57085403. The next prime is 57085513. The reversal of 57085440 is 4458075.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3964 + ... + 11396.

Almost surely, 2^57085440 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 57085440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91259784).

57085440 is an abundant number, since it is smaller than the sum of its proper divisors (125434128).

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

57085440 is an equidigital number, since it uses as much as digits as its factorization.

57085440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7459 (or 7443 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 33.

The square root of 57085440 is about 7555.4907186761. The cubic root of 57085440 is about 385.0423071515.

The spelling of 57085440 in words is "fifty-seven million, eighty-five thousand, four hundred forty".