646082464 has 24 divisors (see below), whose sum is σ = 1272599748. Its totient is φ = 322882560.

The previous prime is 646082429. The next prime is 646082477. The reversal of 646082464 is 464280646.

It can be written as a sum of positive squares in 2 ways, for example, as 543262864 + 102819600 = 23308^2 + 10140^2 .

It is a super-2 number, since 2×646082464² = 834845100576622592, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 88024 + ... + 95080.

Almost surely, 2^646082464 is an apocalyptic number.

It is an amenable number.

646082464 is a deficient number, since it is larger than the sum of its proper divisors (626517284).

646082464 is a wasteful number, since it uses less digits than its factorization.

646082464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9928 (or 9920 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 40.

The square root of 646082464 is about 25418.1522538520. The cubic root of 646082464 is about 864.4953292576.

The spelling of 646082464 in words is "six hundred forty-six million, eighty-two thousand, four hundred sixty-four".