72539999 has 16 divisors (see below), whose sum is σ = 86822400. Its totient is φ = 59257440.

The previous prime is 72539983. The next prime is 72540001. The reversal of 72539999 is 99993527.

It is a cyclic number.

It is not a de Polignac number, because 72539999 - 2⁴ = 72539983 is a prime.

72539999 is a modest number, since divided by 9999 gives 7253 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 72539999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72539959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55544 + ... + 56834.

It is an arithmetic number, because the mean of its divisors is an integer number (5426400).

Almost surely, 2^72539999 is an apocalyptic number.

72539999 is a deficient number, since it is larger than the sum of its proper divisors (14282401).

72539999 is a wasteful number, since it uses less digits than its factorization.

72539999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1670.

The product of its digits is 1377810, while the sum is 53.

The square root of 72539999 is about 8517.0416812412. The cubic root of 72539999 is about 417.0542152806.

The spelling of 72539999 in words is "seventy-two million, five hundred thirty-nine thousand, nine hundred ninety-nine".