641696188 has 12 divisors (see below), whose sum is σ = 1283392432. Its totient is φ = 275012640.

The previous prime is 641696173. The next prime is 641696203. The reversal of 641696188 is 881696146.

It is an interprime number because it is at equal distance from previous prime (641696173) and next prime (641696203).

641696188 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11458833 + ... + 11458888.

Almost surely, 2^641696188 is an apocalyptic number.

It is an amenable number.

641696188 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.

641696188 is a wasteful number, since it uses less digits than its factorization.

641696188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22917732 (or 22917730 counting only the distinct ones).

The product of its digits is 497664, while the sum is 49.

The square root of 641696188 is about 25331.7229575882. The cubic root of 641696188 is about 862.5345224017.

The spelling of 641696188 in words is "six hundred forty-one million, six hundred ninety-six thousand, one hundred eighty-eight".