709840645 has 4 divisors (see below), whose sum is σ = 851808780. Its totient is φ = 567872512.

The previous prime is 709840639. The next prime is 709840657. The reversal of 709840645 is 546048907.

709840645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 546048907 = 109 ⋅5009623.

It can be written as a sum of positive squares in 2 ways, for example, as 517380516 + 192460129 = 22746^2 + 13873^2 .

It is a cyclic number.

It is not a de Polignac number, because 709840645 - 2²⁵ = 676286213 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70984060 + ... + 70984069.

It is an arithmetic number, because the mean of its divisors is an integer number (212952195).

Almost surely, 2^709840645 is an apocalyptic number.

It is an amenable number.

709840645 is a deficient number, since it is larger than the sum of its proper divisors (141968135).

709840645 is a wasteful number, since it uses less digits than its factorization.

709840645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141968134.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 709840645 is about 26642.8347778535. The cubic root of 709840645 is about 892.0453924798.

The spelling of 709840645 in words is "seven hundred nine million, eight hundred forty thousand, six hundred forty-five".