722423521 has 8 divisors (see below), whose sum is σ = 740751264. Its totient is φ = 704165280.

The previous prime is 722423519. The next prime is 722423587. The reversal of 722423521 is 125324227.

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 722423521 - 2¹ = 722423519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 722423521.

It is not an unprimeable number, because it can be changed into a prime (722423501) 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, 4005 + ... + 38221.

It is an arithmetic number, because the mean of its divisors is an integer number (92593908).

Almost surely, 2^722423521 is an apocalyptic number.

It is an amenable number.

722423521 is a deficient number, since it is larger than the sum of its proper divisors (18327743).

722423521 is a wasteful number, since it uses less digits than its factorization.

722423521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34751.

The product of its digits is 6720, while the sum is 28.

The square root of 722423521 is about 26877.9374394688. The cubic root of 722423521 is about 897.2854507421.

Adding to 722423521 its reverse (125324227), we get a palindrome (847747748).

The spelling of 722423521 in words is "seven hundred twenty-two million, four hundred twenty-three thousand, five hundred twenty-one".