722653721 has 8 divisors (see below), whose sum is σ = 757905984. Its totient is φ = 687720880.

The previous prime is 722653703. The next prime is 722653727. The reversal of 722653721 is 127356227.

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 722653721 - 2¹⁸ = 722391577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (722653727) 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, 75215 + ... + 84276.

It is an arithmetic number, because the mean of its divisors is an integer number (94738248).

Almost surely, 2^722653721 is an apocalyptic number.

It is an amenable number.

722653721 is a deficient number, since it is larger than the sum of its proper divisors (35252263).

722653721 is a wasteful number, since it uses less digits than its factorization.

722653721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159711.

The product of its digits is 35280, while the sum is 35.

The square root of 722653721 is about 26882.2194210225. The cubic root of 722653721 is about 897.3807471848.

The spelling of 722653721 in words is "seven hundred twenty-two million, six hundred fifty-three thousand, seven hundred twenty-one".