72044209 has 4 divisors (see below), whose sum is σ = 72757620. Its totient is φ = 71330800.

The previous prime is 72044201. The next prime is 72044227. The reversal of 72044209 is 90244027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90244027 = 29 ⋅3111863.

It can be written as a sum of positive squares in 2 ways, for example, as 54066609 + 17977600 = 7353^2 + 4240^2 .

It is a cyclic number.

It is not a de Polignac number, because 72044209 - 2³ = 72044201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72044201) 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 3 ways as a sum of consecutive naturals, for example, 356554 + ... + 356755.

It is an arithmetic number, because the mean of its divisors is an integer number (18189405).

Almost surely, 2^72044209 is an apocalyptic number.

It is an amenable number.

72044209 is a deficient number, since it is larger than the sum of its proper divisors (713411).

72044209 is a wasteful number, since it uses less digits than its factorization.

72044209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713410.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 72044209 is about 8487.8860147860. The cubic root of 72044209 is about 416.1018938797.

The spelling of 72044209 in words is "seventy-two million, forty-four thousand, two hundred nine".