57487640 has 128 divisors (see below), whose sum is σ = 157593600. Its totient is φ = 18455040.

The previous prime is 57487631. The next prime is 57487679. The reversal of 57487640 is 4678475.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 321071 + ... + 321249.

It is an arithmetic number, because the mean of its divisors is an integer number (1231200).

Almost surely, 2^57487640 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 57487640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78796800).

57487640 is an abundant number, since it is smaller than the sum of its proper divisors (100105960).

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

57487640 is a wasteful number, since it uses less digits than its factorization.

57487640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265 (or 261 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 41.

The square root of 57487640 is about 7582.0604059846. The cubic root of 57487640 is about 385.9444737440.

The spelling of 57487640 in words is "fifty-seven million, four hundred eighty-seven thousand, six hundred forty".