72566399 has 2 divisors, whose sum is σ = 72566400. Its totient is φ = 72566398.

The previous prime is 72566383. The next prime is 72566411. The reversal of 72566399 is 99366527.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72566399 - 2⁴ = 72566383 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72566309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36283199 + 36283200.

It is an arithmetic number, because the mean of its divisors is an integer number (36283200).

Almost surely, 2^72566399 is an apocalyptic number.

72566399 is a deficient number, since it is larger than the sum of its proper divisors (1).

72566399 is an equidigital number, since it uses as much as digits as its factorization.

72566399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 612360, while the sum is 47.

The square root of 72566399 is about 8518.5913741651. The cubic root of 72566399 is about 417.1048029841.

The spelling of 72566399 in words is "seventy-two million, five hundred sixty-six thousand, three hundred ninety-nine".