641833920 has 672 divisors, whose sum is σ = 2840248320. Its totient is φ = 129392640.

The previous prime is 641833901. The next prime is 641833943. The reversal of 641833920 is 29338146.

641833920 is a `hidden beast` number, since 641 + 8 + 3 + 3 + 9 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (672).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8124441 + ... + 8124519.

It is an arithmetic number, because the mean of its divisors is an integer number (4226560).

Almost surely, 2^641833920 is an apocalyptic number.

641833920 is a gapful number since it is divisible by the number (60) 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 641833920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1420124160).

641833920 is an abundant number, since it is smaller than the sum of its proper divisors (2198414400).

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

641833920 is a wasteful number, since it uses less digits than its factorization.

641833920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153 (or 140 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 641833920 is about 25334.4413792766. The cubic root of 641833920 is about 862.5962287089.

The spelling of 641833920 in words is "six hundred forty-one million, eight hundred thirty-three thousand, nine hundred twenty".