72221560 has 32 divisors (see below), whose sum is σ = 165168000. Its totient is φ = 28414080.

The previous prime is 72221549. The next prime is 72221561. The reversal of 72221560 is 6512227.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72221561) 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, 12360 + ... + 17239.

It is an arithmetic number, because the mean of its divisors is an integer number (5161500).

Almost surely, 2^72221560 is an apocalyptic number.

It is an amenable number.

72221560 is an abundant number, since it is smaller than the sum of its proper divisors (92946440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72221560 is a wasteful number, since it uses less digits than its factorization.

72221560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29671 (or 29667 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 72221560 is about 8498.3268941598. The cubic root of 72221560 is about 416.4430529919.

Adding to 72221560 its reverse (6512227), we get a palindrome (78733787).

The spelling of 72221560 in words is "seventy-two million, two hundred twenty-one thousand, five hundred sixty".