72108509 has 8 divisors (see below), whose sum is σ = 83291328. Its totient is φ = 61696960.

The previous prime is 72108479. The next prime is 72108563. The reversal of 72108509 is 90580127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72108509 - 2²⁴ = 55331293 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72108109) 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 7 ways as a sum of consecutive naturals, for example, 192617 + ... + 192990.

It is an arithmetic number, because the mean of its divisors is an integer number (10411416).

Almost surely, 2^72108509 is an apocalyptic number.

It is an amenable number.

72108509 is a deficient number, since it is larger than the sum of its proper divisors (11182819).

72108509 is a wasteful number, since it uses less digits than its factorization.

72108509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385635.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 72108509 is about 8491.6729211622. The cubic root of 72108509 is about 416.2256484295.

The spelling of 72108509 in words is "seventy-two million, one hundred eight thousand, five hundred nine".