646713 has 12 divisors (see below), whose sum is σ = 941668. Its totient is φ = 427680.

The previous prime is 646687. The next prime is 646721. The reversal of 646713 is 317646.

646713 is a `hidden beast` number, since 646 + 7 + 13 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 166464 + 480249 = 408^2 + 693^2 .

It is not a de Polignac number, because 646713 - 2¹⁶ = 581177 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (646013) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1431 + ... + 1827.

2⁶⁴⁶⁷¹³ is an apocalyptic number.

It is an amenable number.

646713 is a deficient number, since it is larger than the sum of its proper divisors (294955).

646713 is a wasteful number, since it uses less digits than its factorization.

646713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584 (or 581 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 646713 is about 804.1846802818. The cubic root of 646713 is about 86.4776468909.

The spelling of 646713 in words is "six hundred forty-six thousand, seven hundred thirteen".