72221616 has 60 divisors (see below), whose sum is σ = 205955568. Its totient is φ = 23617152.

The previous prime is 72221561. The next prime is 72221647. The reversal of 72221616 is 61612227.

72221616 is a `hidden beast` number, since 7 + 22 + 21 + 616 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 72221616.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2901 + ... + 12363.

Almost surely, 2^72221616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72221616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102977784).

72221616 is an abundant number, since it is smaller than the sum of its proper divisors (133733952).

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

72221616 is a wasteful number, since it uses less digits than its factorization.

72221616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9530 (or 9521 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 72221616 is about 8498.3301889254. The cubic root of 72221616 is about 416.4431606273.

The spelling of 72221616 in words is "seventy-two million, two hundred twenty-one thousand, six hundred sixteen".