72245213 has 4 divisors (see below), whose sum is σ = 72344508. Its totient is φ = 72145920.

The previous prime is 72245209. The next prime is 72245227. The reversal of 72245213 is 31254227.

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 53392249 + 18852964 = 7307^2 + 4342^2 .

It is a cyclic number.

It is not a de Polignac number, because 72245213 - 2² = 72245209 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 (72245233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48548 + ... + 50013.

It is an arithmetic number, because the mean of its divisors is an integer number (18086127).

Almost surely, 2^72245213 is an apocalyptic number.

It is an amenable number.

72245213 is a deficient number, since it is larger than the sum of its proper divisors (99295).

72245213 is an equidigital number, since it uses as much as digits as its factorization.

72245213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99294.

The product of its digits is 3360, while the sum is 26.

The square root of 72245213 is about 8499.7184071003. The cubic root of 72245213 is about 416.4885105736.

The spelling of 72245213 in words is "seventy-two million, two hundred forty-five thousand, two hundred thirteen".