72245689 has 2 divisors, whose sum is σ = 72245690. Its totient is φ = 72245688.

The previous prime is 72245687. The next prime is 72245707. The reversal of 72245689 is 98654227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50296464 + 21949225 = 7092^2 + 4685^2 .

It is a cyclic number.

It is not a de Polignac number, because 72245689 - 2¹ = 72245687 is a prime.

Together with 72245687, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (72245687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36122844 + 36122845.

It is an arithmetic number, because the mean of its divisors is an integer number (36122845).

Almost surely, 2^72245689 is an apocalyptic number.

It is an amenable number.

72245689 is a deficient number, since it is larger than the sum of its proper divisors (1).

72245689 is an equidigital number, since it uses as much as digits as its factorization.

72245689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 43.

The square root of 72245689 is about 8499.7464079818. The cubic root of 72245689 is about 416.4894252736.

The spelling of 72245689 in words is "seventy-two million, two hundred forty-five thousand, six hundred eighty-nine".