641647926 has 32 divisors (see below), whose sum is σ = 1428779520. Its totient is φ = 213448392.

The previous prime is 641647913. The next prime is 641647987. The reversal of 641647926 is 629746146.

It is a congruent number.

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, 15351 + ... + 38973.

It is an arithmetic number, because the mean of its divisors is an integer number (44649360).

Almost surely, 2^641647926 is an apocalyptic number.

641647926 is an abundant number, since it is smaller than the sum of its proper divisors (787131594).

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

641647926 is a wasteful number, since it uses less digits than its factorization.

641647926 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24137 (or 24131 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 641647926 is about 25330.7703396482. The cubic root of 641647926 is about 862.5128981058.

The spelling of 641647926 in words is "six hundred forty-one million, six hundred forty-seven thousand, nine hundred twenty-six".