72817903 has 2 divisors, whose sum is σ = 72817904. Its totient is φ = 72817902.

The previous prime is 72817897. The next prime is 72817933. The reversal of 72817903 is 30971827.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72817903 - 2²¹ = 70720751 is a prime.

It is a super-3 number, since 3×72817903³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72817933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36408951 + 36408952.

It is an arithmetic number, because the mean of its divisors is an integer number (36408952).

Almost surely, 2^72817903 is an apocalyptic number.

72817903 is a deficient number, since it is larger than the sum of its proper divisors (1).

72817903 is an equidigital number, since it uses as much as digits as its factorization.

72817903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 72817903 is about 8533.3406705698. The cubic root of 72817903 is about 417.5861210939.

The spelling of 72817903 in words is "seventy-two million, eight hundred seventeen thousand, nine hundred three".