641636708 has 6 divisors (see below), whose sum is σ = 1122864246. Its totient is φ = 320818352.

The previous prime is 641636701. The next prime is 641636717. The reversal of 641636708 is 807636146.

641636708 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 628906084 + 12730624 = 25078^2 + 3568^2 .

It is not an unprimeable number, because it can be changed into a prime (641636701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80204585 + ... + 80204592.

It is an arithmetic number, because the mean of its divisors is an integer number (187144041).

Almost surely, 2^641636708 is an apocalyptic number.

It is an amenable number.

641636708 is a deficient number, since it is larger than the sum of its proper divisors (481227538).

641636708 is a wasteful number, since it uses less digits than its factorization.

641636708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160409181 (or 160409179 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 641636708 is about 25330.5489083833. The cubic root of 641636708 is about 862.5078716078.

The spelling of 641636708 in words is "six hundred forty-one million, six hundred thirty-six thousand, seven hundred eight".