641320506 has 12 divisors (see below), whose sum is σ = 1389527802. Its totient is φ = 213773496.

The previous prime is 641320487. The next prime is 641320513. The reversal of 641320506 is 605023146.

641320506 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 634586481 + 6734025 = 25191^2 + 2595^2 .

It is a super-2 number, since 2×641320506² = 822583982832192072, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 641320506.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17814441 + ... + 17814476.

Almost surely, 2^641320506 is an apocalyptic number.

641320506 is an abundant number, since it is smaller than the sum of its proper divisors (748207296).

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

641320506 is a wasteful number, since it uses less digits than its factorization.

641320506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35628925 (or 35628922 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 641320506 is about 25324.3066242691. The cubic root of 641320506 is about 862.3661654973.

The spelling of 641320506 in words is "six hundred forty-one million, three hundred twenty thousand, five hundred six".