641526644 has 12 divisors (see below), whose sum is σ = 1224732768. Its totient is φ = 291603000.

The previous prime is 641526619. The next prime is 641526707. The reversal of 641526644 is 446625146.

It is a junction number, because it is equal to n+sod(n) for n = 641526598 and 641526607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7290032 + ... + 7290119.

It is an arithmetic number, because the mean of its divisors is an integer number (102061064).

Almost surely, 2^641526644 is an apocalyptic number.

It is an amenable number.

641526644 is a deficient number, since it is larger than the sum of its proper divisors (583206124).

641526644 is a wasteful number, since it uses less digits than its factorization.

641526644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14580166 (or 14580164 counting only the distinct ones).

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

The square root of 641526644 is about 25328.3762606291. The cubic root of 641526644 is about 862.4585516454.

The spelling of 641526644 in words is "six hundred forty-one million, five hundred twenty-six thousand, six hundred forty-four".