72709305769 has 2 divisors, whose sum is σ = 72709305770. Its totient is φ = 72709305768.

The previous prime is 72709305763. The next prime is 72709305791. The reversal of 72709305769 is 96750390727.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60140205225 + 12569100544 = 245235^2 + 112112^2 .

It is a cyclic number.

It is not a de Polignac number, because 72709305769 - 2⁵ = 72709305737 is a prime.

It is a super-2 number, since 2×72709305769² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72709305763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36354652884 + 36354652885.

It is an arithmetic number, because the mean of its divisors is an integer number (36354652885).

Almost surely, 2^72709305769 is an apocalyptic number.

It is an amenable number.

72709305769 is a deficient number, since it is larger than the sum of its proper divisors (1).

72709305769 is an equidigital number, since it uses as much as digits as its factorization.

72709305769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5000940, while the sum is 55.

The spelling of 72709305769 in words is "seventy-two billion, seven hundred nine million, three hundred five thousand, seven hundred sixty-nine".