72224641 has 4 divisors (see below), whose sum is σ = 72534852. Its totient is φ = 71914432.

The previous prime is 72224639. The next prime is 72224651. The reversal of 72224641 is 14642227.

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 48944016 + 23280625 = 6996^2 + 4825^2 .

It is a cyclic number.

It is not a de Polignac number, because 72224641 - 2¹ = 72224639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72224651) 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 3 ways as a sum of consecutive naturals, for example, 154756 + ... + 155221.

It is an arithmetic number, because the mean of its divisors is an integer number (18133713).

Almost surely, 2^72224641 is an apocalyptic number.

It is an amenable number.

72224641 is a deficient number, since it is larger than the sum of its proper divisors (310211).

72224641 is a wasteful number, since it uses less digits than its factorization.

72224641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310210.

The product of its digits is 5376, while the sum is 28.

The square root of 72224641 is about 8498.5081632014. The cubic root of 72224641 is about 416.4489747822.

Adding to 72224641 its reverse (14642227), we get a palindrome (86866868).

The spelling of 72224641 in words is "seventy-two million, two hundred twenty-four thousand, six hundred forty-one".