72576309 has 16 divisors (see below), whose sum is σ = 105039872. Its totient is φ = 44307648.

The previous prime is 72576289. The next prime is 72576323. The reversal of 72576309 is 90367527.

It is not a de Polignac number, because 72576309 - 2¹¹ = 72574261 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72576359) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2374 + ... + 12279.

It is an arithmetic number, because the mean of its divisors is an integer number (6564992).

Almost surely, 2^72576309 is an apocalyptic number.

It is an amenable number.

72576309 is a deficient number, since it is larger than the sum of its proper divisors (32463563).

72576309 is a wasteful number, since it uses less digits than its factorization.

72576309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14796.

The product of its (nonzero) digits is 79380, while the sum is 39.

The square root of 72576309 is about 8519.1730232459. The cubic root of 72576309 is about 417.1237893676.

The spelling of 72576309 in words is "seventy-two million, five hundred seventy-six thousand, three hundred nine".