72697640626 has 96 divisors (see below), whose sum is σ = 128539126800. Its totient is φ = 30745128960.

The previous prime is 72697640599. The next prime is 72697640627. The reversal of 72697640626 is 62604679627.

It is a Cunningham number, because it is equal to 269625²+1.

It can be written as a sum of positive squares in 24 ways, for example, as 7646628025 + 65051012601 = 87445^2 + 255051^2 .

It is not an unprimeable number, because it can be changed into a prime (72697640627) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14867190 + ... + 14872078.

Almost surely, 2^72697640626 is an apocalyptic number.

72697640626 is a deficient number, since it is larger than the sum of its proper divisors (55841486174).

72697640626 is a wasteful number, since it uses less digits than its factorization.

72697640626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5024 (or 5011 counting only the distinct ones).

The product of its (nonzero) digits is 9144576, while the sum is 55.

The spelling of 72697640626 in words is "seventy-two billion, six hundred ninety-seven million, six hundred forty thousand, six hundred twenty-six".