641399696 has 80 divisors (see below), whose sum is σ = 1469322624. Its totient is φ = 265531392.

The previous prime is 641399687. The next prime is 641399713. The reversal of 641399696 is 696993146.

It is a super-2 number, since 2×641399696² = 822787140057784832, which contains 22 as substring.

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, 466466 + ... + 467838.

Almost surely, 2^641399696 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 641399696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (734661312).

641399696 is an abundant number, since it is smaller than the sum of its proper divisors (827922928).

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

641399696 is a wasteful number, since it uses less digits than its factorization.

641399696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528 (or 1522 counting only the distinct ones).

The product of its digits is 1889568, while the sum is 53.

The square root of 641399696 is about 25325.8700936414. The cubic root of 641399696 is about 862.4016589130.

The spelling of 641399696 in words is "six hundred forty-one million, three hundred ninety-nine thousand, six hundred ninety-six".