646738130 has 16 divisors (see below), whose sum is σ = 1164423384. Its totient is φ = 258629760.

The previous prime is 646738129. The next prime is 646738177. The reversal of 646738130 is 31837646.

It can be written as a sum of positive squares in 4 ways, for example, as 137288089 + 509450041 = 11717^2 + 22571^2 .

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 7 ways as a sum of consecutive naturals, for example, 61670 + ... + 71390.

Almost surely, 2^646738130 is an apocalyptic number.

646738130 is a deficient number, since it is larger than the sum of its proper divisors (517685254).

646738130 is a wasteful number, since it uses less digits than its factorization.

646738130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16381.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 646738130 is about 25431.0465769697. The cubic root of 646738130 is about 864.7876699373.

The spelling of 646738130 in words is "six hundred forty-six million, seven hundred thirty-eight thousand, one hundred thirty".