641815992 has 48 divisors (see below), whose sum is σ = 1740272040. Its totient is φ = 213690048.

The previous prime is 641815961. The next prime is 641816003. The reversal of 641815992 is 299518146.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63478 + ... + 72890.

Almost surely, 2^641815992 is an apocalyptic number.

It is an amenable number.

641815992 is an abundant number, since it is smaller than the sum of its proper divisors (1098456048).

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

641815992 is a wasteful number, since it uses less digits than its factorization.

641815992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10372 (or 10365 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 641815992 is about 25334.0875501763. The cubic root of 641815992 is about 862.5881971560.

The spelling of 641815992 in words is "six hundred forty-one million, eight hundred fifteen thousand, nine hundred ninety-two".