72307769 has 2 divisors, whose sum is σ = 72307770. Its totient is φ = 72307768.

The previous prime is 72307757. The next prime is 72307771. The reversal of 72307769 is 96770327.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41925625 + 30382144 = 6475^2 + 5512^2 .

It is a cyclic number.

It is not a de Polignac number, because 72307769 - 2²⁰ = 71259193 is a prime.

It is a super-2 number, since 2×72307769² = 10456826915514722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 72307771, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (72307799) 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, 36153884 + 36153885.

It is an arithmetic number, because the mean of its divisors is an integer number (36153885).

Almost surely, 2^72307769 is an apocalyptic number.

It is an amenable number.

72307769 is a deficient number, since it is larger than the sum of its proper divisors (1).

72307769 is an equidigital number, since it uses as much as digits as its factorization.

72307769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 111132, while the sum is 41.

The square root of 72307769 is about 8503.3974974712. The cubic root of 72307769 is about 416.6086861900.

The spelling of 72307769 in words is "seventy-two million, three hundred seven thousand, seven hundred sixty-nine".