72183509 has 4 divisors (see below), whose sum is σ = 73545516. Its totient is φ = 70821504.

The previous prime is 72183481. The next prime is 72183521. The reversal of 72183509 is 90538127.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 66471409 + 5712100 = 8153^2 + 2390^2 .

It is a cyclic number.

It is not a de Polignac number, because 72183509 - 2⁸ = 72183253 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 (72183569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 680924 + ... + 681029.

It is an arithmetic number, because the mean of its divisors is an integer number (18386379).

Almost surely, 2^72183509 is an apocalyptic number.

It is an amenable number.

72183509 is a deficient number, since it is larger than the sum of its proper divisors (1362007).

72183509 is a wasteful number, since it uses less digits than its factorization.

72183509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1362006.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 72183509 is about 8496.0878644232. The cubic root of 72183509 is about 416.3699037442.

The spelling of 72183509 in words is "seventy-two million, one hundred eighty-three thousand, five hundred nine".