646926692 has 24 divisors (see below), whose sum is σ = 1154979000. Its totient is φ = 316948736.

The previous prime is 646926691. The next prime is 646926719. The reversal of 646926692 is 296629646.

It can be written as a sum of positive squares in 4 ways, for example, as 428655616 + 218271076 = 20704^2 + 14774^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 646926692.

It is not an unprimeable number, because it can be changed into a prime (646926691) 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, 220934 + ... + 223842.

It is an arithmetic number, because the mean of its divisors is an integer number (48124125).

Almost surely, 2^646926692 is an apocalyptic number.

It is an amenable number.

646926692 is a deficient number, since it is larger than the sum of its proper divisors (508052308).

646926692 is a wasteful number, since it uses less digits than its factorization.

646926692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4015 (or 4013 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 50.

The square root of 646926692 is about 25434.7536256988. The cubic root of 646926692 is about 864.8717071696.

The spelling of 646926692 in words is "six hundred forty-six million, nine hundred twenty-six thousand, six hundred ninety-two".