72368909 has 2 divisors, whose sum is σ = 72368910. Its totient is φ = 72368908.

The previous prime is 72368873. The next prime is 72368927. The reversal of 72368909 is 90986327.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48260809 + 24108100 = 6947^2 + 4910^2 .

It is an emirp because it is prime and its reverse (90986327) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72368909 - 2¹⁶ = 72303373 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 72368909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72368939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36184454 + 36184455.

It is an arithmetic number, because the mean of its divisors is an integer number (36184455).

Almost surely, 2^72368909 is an apocalyptic number.

It is an amenable number.

72368909 is a deficient number, since it is larger than the sum of its proper divisors (1).

72368909 is an equidigital number, since it uses as much as digits as its factorization.

72368909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 72368909 is about 8506.9917714783. The cubic root of 72368909 is about 416.7260745871.

The spelling of 72368909 in words is "seventy-two million, three hundred sixty-eight thousand, nine hundred nine".