646326813 has 16 divisors (see below), whose sum is σ = 941371200. Its totient is φ = 391188480.

The previous prime is 646326797. The next prime is 646326817. The reversal of 646326813 is 318623646.

It is not a de Polignac number, because 646326813 - 2⁴ = 646326797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646326817) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 12643 + ... + 38111.

It is an arithmetic number, because the mean of its divisors is an integer number (58835700).

Almost surely, 2^646326813 is an apocalyptic number.

It is an amenable number.

646326813 is a deficient number, since it is larger than the sum of its proper divisors (295044387).

646326813 is a wasteful number, since it uses less digits than its factorization.

646326813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26252.

The product of its digits is 124416, while the sum is 39.

The square root of 646326813 is about 25422.9583841063. The cubic root of 646326813 is about 864.6042998387.

The spelling of 646326813 in words is "six hundred forty-six million, three hundred twenty-six thousand, eight hundred thirteen".