641864376 has 144 divisors (see below), whose sum is σ = 1870182600. Its totient is φ = 198816768.

The previous prime is 641864339. The next prime is 641864401. The reversal of 641864376 is 673468146.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2267931 + ... + 2268213.

Almost surely, 2^641864376 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 641864376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (935091300).

641864376 is an abundant number, since it is smaller than the sum of its proper divisors (1228318224).

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

641864376 is a wasteful number, since it uses less digits than its factorization.

641864376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438 (or 414 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 641864376 is about 25335.0424511190. The cubic root of 641864376 is about 862.6098723294.

The spelling of 641864376 in words is "six hundred forty-one million, eight hundred sixty-four thousand, three hundred seventy-six".