722872891 has 4 divisors (see below), whose sum is σ = 778478512. Its totient is φ = 667267272.

The previous prime is 722872853. The next prime is 722872901. The reversal of 722872891 is 198278227.

It is a happy number.

722872891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 722872891 - 2¹¹ = 722870843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (722872991) 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, 27802791 + ... + 27802816.

It is an arithmetic number, because the mean of its divisors is an integer number (194619628).

Almost surely, 2^722872891 is an apocalyptic number.

722872891 is a deficient number, since it is larger than the sum of its proper divisors (55605621).

722872891 is a wasteful number, since it uses less digits than its factorization.

722872891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55605620.

The product of its digits is 225792, while the sum is 46.

The square root of 722872891 is about 26886.2955983155. The cubic root of 722872891 is about 897.4714587076.

The spelling of 722872891 in words is "seven hundred twenty-two million, eight hundred seventy-two thousand, eight hundred ninety-one".