646679762 has 16 divisors (see below), whose sum is σ = 1030008312. Its totient is φ = 303452160.

The previous prime is 646679749. The next prime is 646679767. The reversal of 646679762 is 267976646.

It can be written as a sum of positive squares in 4 ways, for example, as 599221441 + 47458321 = 24479^2 + 6889^2 .

It is not an unprimeable number, because it can be changed into a prime (646679767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14939 + ... + 38942.

Almost surely, 2^646679762 is an apocalyptic number.

646679762 is a deficient number, since it is larger than the sum of its proper divisors (383328550).

646679762 is a wasteful number, since it uses less digits than its factorization.

646679762 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54253.

The product of its digits is 4572288, while the sum is 53.

The square root of 646679762 is about 25429.8989773849. The cubic root of 646679762 is about 864.7616535107.

The spelling of 646679762 in words is "six hundred forty-six million, six hundred seventy-nine thousand, seven hundred sixty-two".