646630676 has 6 divisors (see below), whose sum is σ = 1131603690. Its totient is φ = 323315336.

The previous prime is 646630669. The next prime is 646630693. The reversal of 646630676 is 676036646.

It can be written as a sum of positive squares in only one way, i.e., 646176400 + 454276 = 25420^2 + 674^2 .

It is a super-2 number, since 2×646630676² = 836262462288433952, which contains 22 as substring.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 80828831 + ... + 80828838.

It is an arithmetic number, because the mean of its divisors is an integer number (188600615).

Almost surely, 2^646630676 is an apocalyptic number.

It is an amenable number.

646630676 is a deficient number, since it is larger than the sum of its proper divisors (484973014).

646630676 is a wasteful number, since it uses less digits than its factorization.

646630676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161657673 (or 161657671 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 44.

The square root of 646630676 is about 25428.9338352987. The cubic root of 646630676 is about 864.7397731473.

The spelling of 646630676 in words is "six hundred forty-six million, six hundred thirty thousand, six hundred seventy-six".