641099264 has 80 divisors (see below), whose sum is σ = 1402983120. Its totient is φ = 290856960.

The previous prime is 641099233. The next prime is 641099297. The reversal of 641099264 is 462990146.

It is a super-2 number, since 2×641099264² = 822016532602683392, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 405227 + ... + 406805.

It is an arithmetic number, because the mean of its divisors is an integer number (17537289).

Almost surely, 2^641099264 is an apocalyptic number.

641099264 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641099264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (701491560).

641099264 is an abundant number, since it is smaller than the sum of its proper divisors (761883856).

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

641099264 is a wasteful number, since it uses less digits than its factorization.

641099264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1671 (or 1655 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 641099264 is about 25319.9380725941. The cubic root of 641099264 is about 862.2669880671.

The spelling of 641099264 in words is "six hundred forty-one million, ninety-nine thousand, two hundred sixty-four".