72909533 has 2 divisors, whose sum is σ = 72909534. Its totient is φ = 72909532.

The previous prime is 72909523. The next prime is 72909539. The reversal of 72909533 is 33590927.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52461049 + 20448484 = 7243^2 + 4522^2 .

It is an emirp because it is prime and its reverse (33590927) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72909533 - 2⁶ = 72909469 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72909539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36454766 + 36454767.

It is an arithmetic number, because the mean of its divisors is an integer number (36454767).

Almost surely, 2^72909533 is an apocalyptic number.

It is an amenable number.

72909533 is a deficient number, since it is larger than the sum of its proper divisors (1).

72909533 is an equidigital number, since it uses as much as digits as its factorization.

72909533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51030, while the sum is 38.

The square root of 72909533 is about 8538.7079233336. The cubic root of 72909533 is about 417.7612033946.

The spelling of 72909533 in words is "seventy-two million, nine hundred nine thousand, five hundred thirty-three".