22726818 has 48 divisors (see below), whose sum is σ = 51682176. Its totient is φ = 7484400.

The previous prime is 22726817. The next prime is 22726853. The reversal of 22726818 is 81862722.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22726817) 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 23 ways as a sum of consecutive naturals, for example, 48855 + ... + 49317.

It is an arithmetic number, because the mean of its divisors is an integer number (1076712).

Almost surely, 2^22726818 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22726818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25841088).

22726818 is an abundant number, since it is smaller than the sum of its proper divisors (28955358).

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

22726818 is a wasteful number, since it uses less digits than its factorization.

22726818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581 (or 569 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 22726818 is about 4767.2652537907. The cubic root of 22726818 is about 283.2562783156.

The spelling of 22726818 in words is "twenty-two million, seven hundred twenty-six thousand, eight hundred eighteen".