709766721 has 6 divisors (see below), whose sum is σ = 1025218610. Its totient is φ = 473177808.

The previous prime is 709766713. The next prime is 709766747. The reversal of 709766721 is 127667907.

It can be written as a sum of positive squares in only one way, i.e., 708890625 + 876096 = 26625^2 + 936^2 .

It is not a de Polignac number, because 709766721 - 2³ = 709766713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (709761721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39431476 + ... + 39431493.

Almost surely, 2^709766721 is an apocalyptic number.

It is an amenable number.

709766721 is a deficient number, since it is larger than the sum of its proper divisors (315451889).

709766721 is a wasteful number, since it uses less digits than its factorization.

709766721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78862975 (or 78862972 counting only the distinct ones).

The product of its (nonzero) digits is 222264, while the sum is 45.

The square root of 709766721 is about 26641.4474268948. The cubic root of 709766721 is about 892.0144250350.

The spelling of 709766721 in words is "seven hundred nine million, seven hundred sixty-six thousand, seven hundred twenty-one".