72221016 has 32 divisors (see below), whose sum is σ = 206346240. Its totient is φ = 20634528.

The previous prime is 72220997. The next prime is 72221027. The reversal of 72221016 is 61012227.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 72220983 and 72221001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214776 + ... + 215111.

It is an arithmetic number, because the mean of its divisors is an integer number (6448320).

Almost surely, 2^72221016 is an apocalyptic number.

It is an amenable number.

72221016 is an abundant number, since it is smaller than the sum of its proper divisors (134125224).

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

72221016 is a wasteful number, since it uses less digits than its factorization.

72221016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429903 (or 429899 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 72221016 is about 8498.2948877996. The cubic root of 72221016 is about 416.4420073872.

The spelling of 72221016 in words is "seventy-two million, two hundred twenty-one thousand, sixteen".