72255697 has 2 divisors, whose sum is σ = 72255698. Its totient is φ = 72255696.

The previous prime is 72255679. The next prime is 72255731. The reversal of 72255697 is 79655227.

Together with previous prime (72255679) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51969681 + 20286016 = 7209^2 + 4504^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72255697 is a prime.

It is not a weakly prime, because it can be changed into another prime (72255607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36127848 + 36127849.

It is an arithmetic number, because the mean of its divisors is an integer number (36127849).

Almost surely, 2^72255697 is an apocalyptic number.

It is an amenable number.

72255697 is a deficient number, since it is larger than the sum of its proper divisors (1).

72255697 is an equidigital number, since it uses as much as digits as its factorization.

72255697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 264600, while the sum is 43.

The square root of 72255697 is about 8500.3351110412. The cubic root of 72255697 is about 416.5086561037.

The spelling of 72255697 in words is "seventy-two million, two hundred fifty-five thousand, six hundred ninety-seven".