72228769 has 2 divisors, whose sum is σ = 72228770. Its totient is φ = 72228768.

The previous prime is 72228743. The next prime is 72228787. The reversal of 72228769 is 96782227.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47775744 + 24453025 = 6912^2 + 4945^2 .

It is a cyclic number.

It is not a de Polignac number, because 72228769 - 2⁷ = 72228641 is a prime.

It is a super-2 number, since 2×72228769² = 10433990142510722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72228799) 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, 36114384 + 36114385.

It is an arithmetic number, because the mean of its divisors is an integer number (36114385).

Almost surely, 2^72228769 is an apocalyptic number.

It is an amenable number.

72228769 is a deficient number, since it is larger than the sum of its proper divisors (1).

72228769 is an equidigital number, since it uses as much as digits as its factorization.

72228769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 43.

The square root of 72228769 is about 8498.7510258861. The cubic root of 72228769 is about 416.4569086793.

The spelling of 72228769 in words is "seventy-two million, two hundred twenty-eight thousand, seven hundred sixty-nine".