646138713 has 16 divisors (see below), whose sum is σ = 949148352. Its totient is φ = 387720000.

The previous prime is 646138711. The next prime is 646138723. The reversal of 646138713 is 317831646.

It is not a de Polignac number, because 646138713 - 2¹ = 646138711 is a prime.

It is not an unprimeable number, because it can be changed into a prime (646138711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93598 + ... + 100263.

It is an arithmetic number, because the mean of its divisors is an integer number (59321772).

Almost surely, 2^646138713 is an apocalyptic number.

It is an amenable number.

646138713 is a deficient number, since it is larger than the sum of its proper divisors (303009639).

646138713 is a wasteful number, since it uses less digits than its factorization.

646138713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193976.

The product of its digits is 72576, while the sum is 39.

The square root of 646138713 is about 25419.2587028025. The cubic root of 646138713 is about 864.5204166571.

The spelling of 646138713 in words is "six hundred forty-six million, one hundred thirty-eight thousand, seven hundred thirteen".