72190909 has 16 divisors (see below), whose sum is σ = 85543936. Its totient is φ = 59616000.

The previous prime is 72190903. The next prime is 72190913. The reversal of 72190909 is 90909127.

It is a cyclic number.

It is not a de Polignac number, because 72190909 - 2⁹ = 72190397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72190903) 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, 59509 + ... + 60709.

It is an arithmetic number, because the mean of its divisors is an integer number (5346496).

Almost surely, 2^72190909 is an apocalyptic number.

It is an amenable number.

72190909 is a deficient number, since it is larger than the sum of its proper divisors (13353027).

72190909 is a wasteful number, since it uses less digits than its factorization.

72190909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1516.

The product of its (nonzero) digits is 10206, while the sum is 37.

The square root of 72190909 is about 8496.5233478170. The cubic root of 72190909 is about 416.3841315184.

The spelling of 72190909 in words is "seventy-two million, one hundred ninety thousand, nine hundred nine".