72217932929 has 4 divisors (see below), whose sum is σ = 72220201284. Its totient is φ = 72215664576.

The previous prime is 72217932911. The next prime is 72217932949. The reversal of 72217932929 is 92923971227.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 42169443904 + 30048489025 = 205352^2 + 173345^2 .

It is a cyclic number.

It is not a de Polignac number, because 72217932929 - 2²⁰ = 72216884353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72217932949) 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, 1085732 + ... + 1150325.

It is an arithmetic number, because the mean of its divisors is an integer number (18055050321).

Almost surely, 2^72217932929 is an apocalyptic number.

It is an amenable number.

72217932929 is a deficient number, since it is larger than the sum of its proper divisors (2268355).

72217932929 is a wasteful number, since it uses less digits than its factorization.

72217932929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2268354.

The product of its digits is 1714608, while the sum is 53.

The spelling of 72217932929 in words is "seventy-two billion, two hundred seventeen million, nine hundred thirty-two thousand, nine hundred twenty-nine".