721613713 has 8 divisors (see below), whose sum is σ = 735141440. Its totient is φ = 708140880.

The previous prime is 721613663. The next prime is 721613723. The reversal of 721613713 is 317316127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-721613713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721613723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13306 + ... + 40252.

It is an arithmetic number, because the mean of its divisors is an integer number (91892680).

Almost surely, 2^721613713 is an apocalyptic number.

It is an amenable number.

721613713 is a deficient number, since it is larger than the sum of its proper divisors (13527727).

721613713 is a wasteful number, since it uses less digits than its factorization.

721613713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27447.

The product of its digits is 5292, while the sum is 31.

The square root of 721613713 is about 26862.8686666186. The cubic root of 721613713 is about 896.9500516344.

The spelling of 721613713 in words is "seven hundred twenty-one million, six hundred thirteen thousand, seven hundred thirteen".