640758804 has 24 divisors (see below), whose sum is σ = 1708690368. Its totient is φ = 183073920.

The previous prime is 640758791. The next prime is 640758827. The reversal of 640758804 is 408857046.

640758804 is nontrivially palindromic in base 13.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3813957 + ... + 3814124.

It is an arithmetic number, because the mean of its divisors is an integer number (71195432).

Almost surely, 2^640758804 is an apocalyptic number.

It is an amenable number.

640758804 is an abundant number, since it is smaller than the sum of its proper divisors (1067931564).

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

640758804 is a wasteful number, since it uses less digits than its factorization.

640758804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7628095 (or 7628093 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 42.

The square root of 640758804 is about 25313.2140195590. The cubic root of 640758804 is about 862.1143235124.

The spelling of 640758804 in words is "six hundred forty million, seven hundred fifty-eight thousand, eight hundred four".