72156009 has 8 divisors (see below), whose sum is σ = 96295392. Its totient is φ = 48060320.

The previous prime is 72155971. The next prime is 72156011. The reversal of 72156009 is 90065127.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72156009 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72156059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6852 + ... + 13829.

It is an arithmetic number, because the mean of its divisors is an integer number (12036924).

Almost surely, 2^72156009 is an apocalyptic number.

It is an amenable number.

72156009 is a deficient number, since it is larger than the sum of its proper divisors (24139383).

72156009 is a wasteful number, since it uses less digits than its factorization.

72156009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21847.

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 72156009 is about 8494.4693183271. The cubic root of 72156009 is about 416.3170217361.

The spelling of 72156009 in words is "seventy-two million, one hundred fifty-six thousand, nine".