643612404 has 24 divisors (see below), whose sum is σ = 1567056960. Its totient is φ = 205209664.

The previous prime is 643612397. The next prime is 643612439. The reversal of 643612404 is 404216346.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1165689 + ... + 1166240.

It is an arithmetic number, because the mean of its divisors is an integer number (65294040).

Almost surely, 2^643612404 is an apocalyptic number.

It is an amenable number.

643612404 is an abundant number, since it is smaller than the sum of its proper divisors (923444556).

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

643612404 is a wasteful number, since it uses less digits than its factorization.

643612404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2331959 (or 2331957 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 643612404 is about 25369.5172204754. The cubic root of 643612404 is about 863.3922283911.

The spelling of 643612404 in words is "six hundred forty-three million, six hundred twelve thousand, four hundred four".