72221808 has 40 divisors (see below), whose sum is σ = 187059456. Its totient is φ = 24011200.

The previous prime is 72221801. The next prime is 72221813. The reversal of 72221808 is 80812227.

It is a happy number.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72221801) 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, 18943 + ... + 22433.

Almost surely, 2^72221808 is an apocalyptic number.

It is an amenable number.

72221808 is an abundant number, since it is smaller than the sum of its proper divisors (114837648).

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

72221808 is a wasteful number, since it uses less digits than its factorization.

72221808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3933 (or 3927 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 72221808 is about 8498.3414852546. The cubic root of 72221808 is about 416.4435296628.

The spelling of 72221808 in words is "seventy-two million, two hundred twenty-one thousand, eight hundred eight".