641765376 has 208 divisors, whose sum is σ = 2175529600. Its totient is φ = 183140352.

The previous prime is 641765357. The next prime is 641765381. The reversal of 641765376 is 673567146.

641765376 is a `hidden beast` number, since 6 + 41 + 76 + 537 + 6 = 666.

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, 773730 + ... + 774558.

Almost surely, 2^641765376 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641765376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1087764800).

641765376 is an abundant number, since it is smaller than the sum of its proper divisors (1533764224).

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

641765376 is an equidigital number, since it uses as much as digits as its factorization.

641765376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869 (or 841 counting only the distinct ones).

The product of its digits is 635040, while the sum is 45.

The square root of 641765376 is about 25333.0885602210. The cubic root of 641765376 is about 862.5655209204.

The spelling of 641765376 in words is "six hundred forty-one million, seven hundred sixty-five thousand, three hundred seventy-six".