640204862 has 32 divisors (see below), whose sum is σ = 1104067584. Its totient is φ = 275572000.

The previous prime is 640204847. The next prime is 640204883. The reversal of 640204862 is 268402046.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44843 + ... + 57369.

It is an arithmetic number, because the mean of its divisors is an integer number (34502112).

Almost surely, 2^640204862 is an apocalyptic number.

640204862 is a deficient number, since it is larger than the sum of its proper divisors (463862722).

640204862 is a wasteful number, since it uses less digits than its factorization.

640204862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12664.

The product of its (nonzero) digits is 18432, while the sum is 32.

The square root of 640204862 is about 25302.2698981732. The cubic root of 640204862 is about 861.8658165784.

It can be divided in two parts, 640 and 204862, that added together give a palindrome (205502).

The spelling of 640204862 in words is "six hundred forty million, two hundred four thousand, eight hundred sixty-two".