72817539 has 16 divisors (see below), whose sum is σ = 99225600. Its totient is φ = 47488896.

The previous prime is 72817531. The next prime is 72817561. The reversal of 72817539 is 93571827.

It is not a de Polignac number, because 72817539 - 2³ = 72817531 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72817539.

It is not an unprimeable number, because it can be changed into a prime (72817531) 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 in 15 ways as a sum of consecutive naturals, for example, 25422 + ... + 28140.

It is an arithmetic number, because the mean of its divisors is an integer number (6201600).

Almost surely, 2^72817539 is an apocalyptic number.

72817539 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

72817539 is a deficient number, since it is larger than the sum of its proper divisors (26408061).

72817539 is a wasteful number, since it uses less digits than its factorization.

72817539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2914.

The product of its digits is 105840, while the sum is 42.

The square root of 72817539 is about 8533.3193424364. The cubic root of 72817539 is about 417.5854252870.

The spelling of 72817539 in words is "seventy-two million, eight hundred seventeen thousand, five hundred thirty-nine".