72817722 has 24 divisors (see below), whose sum is σ = 161621460. Its totient is φ = 23680320.

The previous prime is 72817721. The next prime is 72817727. The reversal of 72817722 is 22771827.

It can be written as a sum of positive squares in 2 ways, for example, as 49575681 + 23242041 = 7041^2 + 4821^2 .

It is not an unprimeable number, because it can be changed into a prime (72817721) 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 11 ways as a sum of consecutive naturals, for example, 48597 + ... + 50072.

Almost surely, 2^72817722 is an apocalyptic number.

72817722 is an abundant number, since it is smaller than the sum of its proper divisors (88803738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72817722 is a wasteful number, since it uses less digits than its factorization.

72817722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98718 (or 98715 counting only the distinct ones).

The product of its digits is 21952, while the sum is 36.

The square root of 72817722 is about 8533.3300651035. The cubic root of 72817722 is about 417.5857751023.

The spelling of 72817722 in words is "seventy-two million, eight hundred seventeen thousand, seven hundred twenty-two".