709328509 has 6 divisors (see below), whose sum is σ = 716116830. Its totient is φ = 702545400.

The previous prime is 709328483. The next prime is 709328513. The reversal of 709328509 is 905823907.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 650760100 + 58568409 = 25510^2 + 7653^2 .

It is not a de Polignac number, because 709328509 - 2⁷ = 709328381 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 (709320509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 276784 + ... + 279334.

It is an arithmetic number, because the mean of its divisors is an integer number (119352805).

Almost surely, 2^709328509 is an apocalyptic number.

It is an amenable number.

709328509 is a deficient number, since it is larger than the sum of its proper divisors (6788321).

709328509 is an frugal number, since it uses more digits than its factorization.

709328509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5211 (or 2660 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 709328509 is about 26633.2219042308. The cubic root of 709328509 is about 891.8308098240.

The spelling of 709328509 in words is "seven hundred nine million, three hundred twenty-eight thousand, five hundred nine".