641799972 has 108 divisors (see below), whose sum is σ = 1793374128. Its totient is φ = 193380000.

The previous prime is 641799959. The next prime is 641799979. The reversal of 641799972 is 279997146.

It is not an unprimeable number, because it can be changed into a prime (641799979) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 1093063 + ... + 1093649.

It is an arithmetic number, because the mean of its divisors is an integer number (16605316).

Almost surely, 2^641799972 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 641799972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (896687064).

641799972 is an abundant number, since it is smaller than the sum of its proper divisors (1151574156).

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

641799972 is a wasteful number, since it uses less digits than its factorization.

641799972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870 (or 854 counting only the distinct ones).

The product of its digits is 1714608, while the sum is 54.

The square root of 641799972 is about 25333.7713734059. The cubic root of 641799972 is about 862.5810202403.

The spelling of 641799972 in words is "six hundred forty-one million, seven hundred ninety-nine thousand, nine hundred seventy-two".