641970906 has 32 divisors (see below), whose sum is σ = 1318076160. Its totient is φ = 208376064.

The previous prime is 641970863. The next prime is 641970943. The reversal of 641970906 is 609079146.

641970906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 25326 + ... + 43878.

It is an arithmetic number, because the mean of its divisors is an integer number (41189880).

Almost surely, 2^641970906 is an apocalyptic number.

641970906 is an abundant number, since it is smaller than the sum of its proper divisors (676105254).

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

641970906 is a wasteful number, since it uses less digits than its factorization.

641970906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18710.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 641970906 is about 25337.1447878406. The cubic root of 641970906 is about 862.6575920397.

The spelling of 641970906 in words is "six hundred forty-one million, nine hundred seventy thousand, nine hundred six".