72225561 has 8 divisors (see below), whose sum is σ = 96704640. Its totient is φ = 47948432.

The previous prime is 72225553. The next prime is 72225577. The reversal of 72225561 is 16552227.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72225561 - 2³ = 72225553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72225541) 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 7 ways as a sum of consecutive naturals, for example, 49650 + ... + 51083.

It is an arithmetic number, because the mean of its divisors is an integer number (12088080).

Almost surely, 2^72225561 is an apocalyptic number.

It is an amenable number.

72225561 is a deficient number, since it is larger than the sum of its proper divisors (24479079).

72225561 is a wasteful number, since it uses less digits than its factorization.

72225561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100975.

The product of its digits is 8400, while the sum is 30.

The square root of 72225561 is about 8498.5622901759. The cubic root of 72225561 is about 416.4507430219.

Adding to 72225561 its reverse (16552227), we get a palindrome (88777788).

The spelling of 72225561 in words is "seventy-two million, two hundred twenty-five thousand, five hundred sixty-one".