646968744 has 24 divisors (see below), whose sum is σ = 1752207210. Its totient is φ = 215656224.

The previous prime is 646968727. The next prime is 646968767. The reversal of 646968744 is 447869646.

It can be written as a sum of positive squares in only one way, i.e., 513566244 + 133402500 = 22662^2 + 11550^2 .

It is a tau number, because it is divible by the number of its divisors (24).

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 5 ways as a sum of consecutive naturals, for example, 4492767 + ... + 4492910.

Almost surely, 2^646968744 is an apocalyptic number.

It is an amenable number.

646968744 is an abundant number, since it is smaller than the sum of its proper divisors (1105238466).

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

646968744 is a wasteful number, since it uses less digits than its factorization.

646968744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8985689 (or 8985682 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 54.

The square root of 646968744 is about 25435.5802764553. The cubic root of 646968744 is about 864.8904464371.

The spelling of 646968744 in words is "six hundred forty-six million, nine hundred sixty-eight thousand, seven hundred forty-four".