641678996 has 12 divisors (see below), whose sum is σ = 1283358048. Its totient is φ = 275005272.

The previous prime is 641678941. The next prime is 641679019. The reversal of 641678996 is 699876146.

641678996 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11458526 + ... + 11458581.

It is an arithmetic number, because the mean of its divisors is an integer number (106946504).

Almost surely, 2^641678996 is an apocalyptic number.

It is an amenable number.

641678996 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

641678996 is a wasteful number, since it uses less digits than its factorization.

641678996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22917118 (or 22917116 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 56.

The square root of 641678996 is about 25331.3836179550. The cubic root of 641678996 is about 862.5268194699.

The spelling of 641678996 in words is "six hundred forty-one million, six hundred seventy-eight thousand, nine hundred ninety-six".