709568639 has 6 divisors (see below), whose sum is σ = 768349656. Its totient is φ = 654986280.

The previous prime is 709568617. The next prime is 709568663. The reversal of 709568639 is 936865907.

It is not a de Polignac number, because 709568639 - 2²⁸ = 441133183 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 (709562639) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2099147 + ... + 2099484.

It is an arithmetic number, because the mean of its divisors is an integer number (128058276).

Almost surely, 2^709568639 is an apocalyptic number.

709568639 is a deficient number, since it is larger than the sum of its proper divisors (58781017).

709568639 is a wasteful number, since it uses less digits than its factorization.

709568639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4198657 (or 4198644 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 53.

The square root of 709568639 is about 26637.7296142145. The cubic root of 709568639 is about 891.9314360586.

The spelling of 709568639 in words is "seven hundred nine million, five hundred sixty-eight thousand, six hundred thirty-nine".