72478440737 has 2 divisors, whose sum is σ = 72478440738. Its totient is φ = 72478440736.

The previous prime is 72478440731. The next prime is 72478440757. The reversal of 72478440737 is 73704487427.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64744293601 + 7734147136 = 254449^2 + 87944^2 .

It is a cyclic number.

It is not a de Polignac number, because 72478440737 - 2⁴ = 72478440721 is a prime.

It is a super-2 number, since 2×72478440737² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72478440731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36239220368 + 36239220369.

It is an arithmetic number, because the mean of its divisors is an integer number (36239220369).

Almost surely, 2^72478440737 is an apocalyptic number.

It is an amenable number.

72478440737 is a deficient number, since it is larger than the sum of its proper divisors (1).

72478440737 is an equidigital number, since it uses as much as digits as its factorization.

72478440737 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7375872, while the sum is 53.

The spelling of 72478440737 in words is "seventy-two billion, four hundred seventy-eight million, four hundred forty thousand, seven hundred thirty-seven".