22721808 has 40 divisors (see below), whose sum is σ = 58900000. Its totient is φ = 7547904.

The previous prime is 22721807. The next prime is 22721827. The reversal of 22721808 is 80812722.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (22721801) 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, 17568 + ... + 18816.

It is an arithmetic number, because the mean of its divisors is an integer number (1472500).

Almost surely, 2^22721808 is an apocalyptic number.

It is an amenable number.

22721808 is an abundant number, since it is smaller than the sum of its proper divisors (36178192).

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

22721808 is a wasteful number, since it uses less digits than its factorization.

22721808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1639 (or 1633 counting only the distinct ones).

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

The square root of 22721808 is about 4766.7397663393. The cubic root of 22721808 is about 283.2354626982.

The spelling of 22721808 in words is "twenty-two million, seven hundred twenty-one thousand, eight hundred eight".