641833812 has 72 divisors (see below), whose sum is σ = 1652361984. Its totient is φ = 210024576.

The previous prime is 641833811. The next prime is 641833831. The reversal of 641833812 is 218338146.

641833812 is a `hidden beast` number, since 641 + 8 + 3 + 3 + 8 + 1 + 2 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641833811) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 743293 + ... + 744155.

It is an arithmetic number, because the mean of its divisors is an integer number (22949472).

Almost surely, 2^641833812 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 641833812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (826180992).

641833812 is an abundant number, since it is smaller than the sum of its proper divisors (1010528172).

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

641833812 is a wasteful number, since it uses less digits than its factorization.

641833812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1229 (or 1224 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 641833812 is about 25334.4392477907. The cubic root of 641833812 is about 862.5961803265.

The spelling of 641833812 in words is "six hundred forty-one million, eight hundred thirty-three thousand, eight hundred twelve".