72817799 has 2 divisors, whose sum is σ = 72817800. Its totient is φ = 72817798.

The previous prime is 72817757. The next prime is 72817819. The reversal of 72817799 is 99771827.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72817799 - 2¹⁶ = 72752263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72817099) 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, 36408899 + 36408900.

It is an arithmetic number, because the mean of its divisors is an integer number (36408900).

Almost surely, 2^72817799 is an apocalyptic number.

72817799 is a deficient number, since it is larger than the sum of its proper divisors (1).

72817799 is an equidigital number, since it uses as much as digits as its factorization.

72817799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 444528, while the sum is 50.

The square root of 72817799 is about 8533.3345768228. The cubic root of 72817799 is about 417.5859222922.

The spelling of 72817799 in words is "seventy-two million, eight hundred seventeen thousand, seven hundred ninety-nine".