646675839 has 16 divisors (see below), whose sum is σ = 980320000. Its totient is φ = 421090488.

The previous prime is 646675807. The next prime is 646675859. The reversal of 646675839 is 938576646.

It is not a de Polignac number, because 646675839 - 2⁵ = 646675807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646675859) 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, 277339 + ... + 279660.

It is an arithmetic number, because the mean of its divisors is an integer number (61270000).

Almost surely, 2^646675839 is an apocalyptic number.

646675839 is a deficient number, since it is larger than the sum of its proper divisors (333644161).

646675839 is a wasteful number, since it uses less digits than its factorization.

646675839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557051 (or 557045 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 54.

The square root of 646675839 is about 25429.8218436544. The cubic root of 646675839 is about 864.7599048518.

The spelling of 646675839 in words is "six hundred forty-six million, six hundred seventy-five thousand, eight hundred thirty-nine".