72436909 has 2 divisors, whose sum is σ = 72436910. Its totient is φ = 72436908.

The previous prime is 72436901. The next prime is 72436919. The reversal of 72436909 is 90963427.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69806025 + 2630884 = 8355^2 + 1622^2 .

It is a cyclic number.

It is not a de Polignac number, because 72436909 - 2³ = 72436901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72436901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36218454 + 36218455.

It is an arithmetic number, because the mean of its divisors is an integer number (36218455).

Almost surely, 2^72436909 is an apocalyptic number.

It is an amenable number.

72436909 is a deficient number, since it is larger than the sum of its proper divisors (1).

72436909 is an equidigital number, since it uses as much as digits as its factorization.

72436909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 72436909 is about 8510.9875455202. The cubic root of 72436909 is about 416.8565565051.

The spelling of 72436909 in words is "seventy-two million, four hundred thirty-six thousand, nine hundred nine".