22921808 has 90 divisors (see below), whose sum is σ = 56264814. Its totient is φ = 9015552.

The previous prime is 22921807. The next prime is 22921813. The reversal of 22921808 is 80812922.

It can be written as a sum of positive squares in 3 ways, for example, as 1317904 + 21603904 = 1148^2 + 4648^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22921807) 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 17 ways as a sum of consecutive naturals, for example, 132410 + ... + 132582.

Almost surely, 2^22921808 is an apocalyptic number.

22921808 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22921808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28132407).

22921808 is an abundant number, since it is smaller than the sum of its proper divisors (33343006).

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

22921808 is a wasteful number, since it uses less digits than its factorization.

22921808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221 (or 195 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 22921808 is about 4787.6725034196. The cubic root of 22921808 is about 284.0640601376.

The spelling of 22921808 in words is "twenty-two million, nine hundred twenty-one thousand, eight hundred eight".