641642564 has 12 divisors (see below), whose sum is σ = 1124332524. Its totient is φ = 320404704.

The previous prime is 641642501. The next prime is 641642621. The reversal of 641642564 is 465246146.

It can be written as a sum of positive squares in 2 ways, for example, as 158961664 + 482680900 = 12608^2 + 21970^2 .

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, 100667 + ... + 106850.

It is an arithmetic number, because the mean of its divisors is an integer number (93694377).

Almost surely, 2^641642564 is an apocalyptic number.

It is an amenable number.

641642564 is a deficient number, since it is larger than the sum of its proper divisors (482689960).

641642564 is a wasteful number, since it uses less digits than its factorization.

641642564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208294 (or 208292 counting only the distinct ones).

The product of its digits is 138240, while the sum is 38.

The square root of 641642564 is about 25330.6644997718. The cubic root of 641642564 is about 862.5104955385.

The spelling of 641642564 in words is "six hundred forty-one million, six hundred forty-two thousand, five hundred sixty-four".