641758404 has 96 divisors (see below), whose sum is σ = 1809948672. Its totient is φ = 173088000.

The previous prime is 641758391. The next prime is 641758423. The reversal of 641758404 is 404857146.

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 31 ways as a sum of consecutive naturals, for example, 103759 + ... + 109769.

It is an arithmetic number, because the mean of its divisors is an integer number (18853632).

Almost surely, 2^641758404 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 641758404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (904974336).

641758404 is an abundant number, since it is smaller than the sum of its proper divisors (1168190268).

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

641758404 is a wasteful number, since it uses less digits than its factorization.

641758404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6097 (or 6095 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 39.

The square root of 641758404 is about 25332.9509532545. The cubic root of 641758404 is about 862.5623973341.

The spelling of 641758404 in words is "six hundred forty-one million, seven hundred fifty-eight thousand, four hundred four".