640032475 has 24 divisors (see below), whose sum is σ = 817202160. Its totient is φ = 496897920.

The previous prime is 640032467. The next prime is 640032487. The reversal of 640032475 is 574230046.

It is not a de Polignac number, because 640032475 - 2³ = 640032467 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 520161 + ... + 521389.

It is an arithmetic number, because the mean of its divisors is an integer number (34050090).

Almost surely, 2^640032475 is an apocalyptic number.

640032475 is a deficient number, since it is larger than the sum of its proper divisors (177169685).

640032475 is a wasteful number, since it uses less digits than its factorization.

640032475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1839 (or 1834 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 31.

The square root of 640032475 is about 25298.8631167489. The cubic root of 640032475 is about 861.7884518634.

The spelling of 640032475 in words is "six hundred forty million, thirty-two thousand, four hundred seventy-five".