641819564 has 12 divisors (see below), whose sum is σ = 1189254024. Its totient is φ = 302032704.

The previous prime is 641819557. The next prime is 641819587. The reversal of 641819564 is 465918146.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 4719194 + ... + 4719329.

It is an arithmetic number, because the mean of its divisors is an integer number (99104502).

Almost surely, 2^641819564 is an apocalyptic number.

It is an amenable number.

641819564 is a deficient number, since it is larger than the sum of its proper divisors (547434460).

641819564 is a wasteful number, since it uses less digits than its factorization.

641819564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9438544 (or 9438542 counting only the distinct ones).

The product of its digits is 207360, while the sum is 44.

The square root of 641819564 is about 25334.1580479794. The cubic root of 641819564 is about 862.5897973859.

The spelling of 641819564 in words is "six hundred forty-one million, eight hundred nineteen thousand, five hundred sixty-four".