72144185 has 4 divisors (see below), whose sum is σ = 86573028. Its totient is φ = 57715344.

The previous prime is 72144179. The next prime is 72144203. The reversal of 72144185 is 58144127.

It is a happy number.

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 50651689 + 21492496 = 7117^2 + 4636^2 .

It is a cyclic number.

It is not a de Polignac number, because 72144185 - 2¹⁶ = 72078649 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 7214414 + ... + 7214423.

It is an arithmetic number, because the mean of its divisors is an integer number (21643257).

Almost surely, 2^72144185 is an apocalyptic number.

It is an amenable number.

72144185 is a deficient number, since it is larger than the sum of its proper divisors (14428843).

72144185 is a wasteful number, since it uses less digits than its factorization.

72144185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14428842.

The product of its digits is 8960, while the sum is 32.

The square root of 72144185 is about 8493.7733075471. The cubic root of 72144185 is about 416.2942802650.

The spelling of 72144185 in words is "seventy-two million, one hundred forty-four thousand, one hundred eighty-five".