722815881 has 4 divisors (see below), whose sum is σ = 963754512. Its totient is φ = 481877252.

The previous prime is 722815823. The next prime is 722815883. The reversal of 722815881 is 188518227.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 722815881 - 2⁶ = 722815817 is a prime.

It is a super-2 number, since 2×722815881² = 1044925595651612322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (722815883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120469311 + ... + 120469316.

It is an arithmetic number, because the mean of its divisors is an integer number (240938628).

Almost surely, 2^722815881 is an apocalyptic number.

It is an amenable number.

722815881 is a deficient number, since it is larger than the sum of its proper divisors (240938631).

722815881 is a wasteful number, since it uses less digits than its factorization.

722815881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240938630.

The product of its digits is 71680, while the sum is 42.

The square root of 722815881 is about 26885.2353718542. The cubic root of 722815881 is about 897.4478647980.

The spelling of 722815881 in words is "seven hundred twenty-two million, eight hundred fifteen thousand, eight hundred eighty-one".