643630704 has 40 divisors (see below), whose sum is σ = 1663710480. Its totient is φ = 214414848.

The previous prime is 643630697. The next prime is 643630723. The reversal of 643630704 is 407036346.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110292 + ... + 115980.

It is an arithmetic number, because the mean of its divisors is an integer number (41592762).

Almost surely, 2^643630704 is an apocalyptic number.

It is an amenable number.

643630704 is an abundant number, since it is smaller than the sum of its proper divisors (1020079776).

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

643630704 is a wasteful number, since it uses less digits than its factorization.

643630704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8057 (or 8051 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 33.

The square root of 643630704 is about 25369.8778869745. The cubic root of 643630704 is about 863.4004113326.

The spelling of 643630704 in words is "six hundred forty-three million, six hundred thirty thousand, seven hundred four".