72221569 has 8 divisors (see below), whose sum is σ = 82681088. Its totient is φ = 61797600.

The previous prime is 72221561. The next prime is 72221647. The reversal of 72221569 is 96512227.

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 72221569 - 2³ = 72221561 is a prime.

It is a super-2 number, since 2×72221569² = 10431910057643522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72221561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4377 + ... + 12790.

It is an arithmetic number, because the mean of its divisors is an integer number (10335136).

Almost surely, 2^72221569 is an apocalyptic number.

It is an amenable number.

72221569 is a deficient number, since it is larger than the sum of its proper divisors (10459519).

72221569 is a wasteful number, since it uses less digits than its factorization.

72221569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17775.

The product of its digits is 15120, while the sum is 34.

The square root of 72221569 is about 8498.3274236758. The cubic root of 72221569 is about 416.4430702904.

The spelling of 72221569 in words is "seventy-two million, two hundred twenty-one thousand, five hundred sixty-nine".