640057352 has 16 divisors (see below), whose sum is σ = 1309208400. Its totient is φ = 290935120.

The previous prime is 640057307. The next prime is 640057367. The reversal of 640057352 is 253750046.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3636602 + ... + 3636777.

It is an arithmetic number, because the mean of its divisors is an integer number (81825525).

Almost surely, 2^640057352 is an apocalyptic number.

It is an amenable number.

640057352 is an abundant number, since it is smaller than the sum of its proper divisors (669151048).

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

640057352 is a wasteful number, since it uses less digits than its factorization.

640057352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7273396 (or 7273392 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 32.

The square root of 640057352 is about 25299.3547743811. The cubic root of 640057352 is about 861.7996171477.

The spelling of 640057352 in words is "six hundred forty million, fifty-seven thousand, three hundred fifty-two".