646764284 has 12 divisors (see below), whose sum is σ = 1168348608. Its totient is φ = 312950400.

The previous prime is 646764193. The next prime is 646764317. The reversal of 646764284 is 482467646.

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, 2607797 + ... + 2608044.

It is an arithmetic number, because the mean of its divisors is an integer number (97362384).

Almost surely, 2^646764284 is an apocalyptic number.

It is an amenable number.

646764284 is a deficient number, since it is larger than the sum of its proper divisors (521584324).

646764284 is a wasteful number, since it uses less digits than its factorization.

646764284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5215876 (or 5215874 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 47.

The square root of 646764284 is about 25431.5607857638. The cubic root of 646764284 is about 864.7993270778.

The spelling of 646764284 in words is "six hundred forty-six million, seven hundred sixty-four thousand, two hundred eighty-four".