641894432 has 72 divisors (see below), whose sum is σ = 1386362880. Its totient is φ = 292193280.

The previous prime is 641894417. The next prime is 641894437. The reversal of 641894432 is 234498146.

It is a self number, because there is not a number n which added to its sum of digits gives 641894432.

It is not an unprimeable number, because it can be changed into a prime (641894437) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 285569 + ... + 287807.

It is an arithmetic number, because the mean of its divisors is an integer number (19255040).

Almost surely, 2^641894432 is an apocalyptic number.

641894432 is a gapful number since it is divisible by the number (62) 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 641894432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (693181440).

641894432 is an abundant number, since it is smaller than the sum of its proper divisors (744468448).

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

641894432 is a wasteful number, since it uses less digits than its factorization.

641894432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2314 (or 2289 counting only the distinct ones).

The product of its digits is 165888, while the sum is 41.

The square root of 641894432 is about 25335.6356146831. The cubic root of 641894432 is about 862.6233363355.

The spelling of 641894432 in words is "six hundred forty-one million, eight hundred ninety-four thousand, four hundred thirty-two".