70723709 has 6 divisors (see below), whose sum is σ = 82270494. Its totient is φ = 60620280.

The previous prime is 70723703. The next prime is 70723711. The reversal of 70723709 is 90732707.

It can be written as a sum of positive squares in only one way, i.e., 35736484 + 34987225 = 5978^2 + 5915^2 .

It is not a de Polignac number, because 70723709 - 2⁴ = 70723693 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 (70723703) 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, 721622 + ... + 721719.

It is an arithmetic number, because the mean of its divisors is an integer number (13711749).

Almost surely, 2^70723709 is an apocalyptic number.

It is an amenable number.

70723709 is a deficient number, since it is larger than the sum of its proper divisors (11546785).

70723709 is a wasteful number, since it uses less digits than its factorization.

70723709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443355 (or 1443348 counting only the distinct ones).

The product of its (nonzero) digits is 18522, while the sum is 35.

The square root of 70723709 is about 8409.7389376841. The cubic root of 70723709 is about 413.5439543253.

The spelling of 70723709 in words is "seventy million, seven hundred twenty-three thousand, seven hundred nine".