722220751 has 6 divisors (see below), whose sum is σ = 840134400. Its totient is φ = 619046316.

The previous prime is 722220739. The next prime is 722220757. The reversal of 722220751 is 157022227.

It is a de Polignac number, because none of the positive numbers 2^k-722220751 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722220757) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7369551 + ... + 7369648.

It is an arithmetic number, because the mean of its divisors is an integer number (140022400).

Almost surely, 2^722220751 is an apocalyptic number.

722220751 is a deficient number, since it is larger than the sum of its proper divisors (117913649).

722220751 is a wasteful number, since it uses less digits than its factorization.

722220751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14739213 (or 14739206 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 722220751 is about 26874.1651219159. The cubic root of 722220751 is about 897.2014927909.

Adding to 722220751 its reverse (157022227), we get a palindrome (879242978).

The spelling of 722220751 in words is "seven hundred twenty-two million, two hundred twenty thousand, seven hundred fifty-one".