640132404 has 24 divisors (see below), whose sum is σ = 1494345888. Its totient is φ = 213276960.

The previous prime is 640132403. The next prime is 640132447. The reversal of 640132404 is 404231046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640132403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16699 + ... + 39485.

It is an arithmetic number, because the mean of its divisors is an integer number (62264412).

Almost surely, 2^640132404 is an apocalyptic number.

It is an amenable number.

640132404 is an abundant number, since it is smaller than the sum of its proper divisors (854213484).

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

640132404 is a wasteful number, since it uses less digits than its factorization.

640132404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25135 (or 25133 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 640132404 is about 25300.8380098367. The cubic root of 640132404 is about 861.8333002006.

The spelling of 640132404 in words is "six hundred forty million, one hundred thirty-two thousand, four hundred four".