721675313 has 8 divisors (see below), whose sum is σ = 764375040. Its totient is φ = 679003200.

The previous prime is 721675261. The next prime is 721675363. The reversal of 721675313 is 313576127.

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

It is a cyclic number.

It is not a de Polignac number, because 721675313 - 2¹⁸ = 721413169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721675363) 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 7 ways as a sum of consecutive naturals, for example, 74288 + ... + 83438.

It is an arithmetic number, because the mean of its divisors is an integer number (95546880).

Almost surely, 2^721675313 is an apocalyptic number.

It is an amenable number.

721675313 is a deficient number, since it is larger than the sum of its proper divisors (42699727).

721675313 is a wasteful number, since it uses less digits than its factorization.

721675313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13807.

The product of its digits is 26460, while the sum is 35.

The square root of 721675313 is about 26864.0152062196. The cubic root of 721675313 is about 896.9755733921.

The spelling of 721675313 in words is "seven hundred twenty-one million, six hundred seventy-five thousand, three hundred thirteen".