72221545 has 16 divisors (see below), whose sum is σ = 94747968. Its totient is φ = 52411840.

The previous prime is 72221543. The next prime is 72221549. The reversal of 72221545 is 54512227.

It is not a de Polignac number, because 72221545 - 2¹ = 72221543 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72221543) 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 15 ways as a sum of consecutive naturals, for example, 31167 + ... + 33403.

It is an arithmetic number, because the mean of its divisors is an integer number (5921748).

Almost surely, 2^72221545 is an apocalyptic number.

It is an amenable number.

72221545 is a deficient number, since it is larger than the sum of its proper divisors (22526423).

72221545 is a wasteful number, since it uses less digits than its factorization.

72221545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2840.

The product of its digits is 5600, while the sum is 28.

The square root of 72221545 is about 8498.3260116331. The cubic root of 72221545 is about 416.4430241609.

The spelling of 72221545 in words is "seventy-two million, two hundred twenty-one thousand, five hundred forty-five".