641909976 has 16 divisors (see below), whose sum is σ = 1604775000. Its totient is φ = 213969984.

The previous prime is 641909971. The next prime is 641909993. The reversal of 641909976 is 679909146.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641909971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13373101 + ... + 13373148.

Almost surely, 2^641909976 is an apocalyptic number.

It is an amenable number.

641909976 is an abundant number, since it is smaller than the sum of its proper divisors (962865024).

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

641909976 is a wasteful number, since it uses less digits than its factorization.

641909976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26746258 (or 26746254 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 51.

The square root of 641909976 is about 25335.9423744214. The cubic root of 641909976 is about 862.6302993231.

The spelling of 641909976 in words is "six hundred forty-one million, nine hundred nine thousand, nine hundred seventy-six".