22681218 has 64 divisors (see below), whose sum is σ = 53913600. Its totient is φ = 6357456.

The previous prime is 22681207. The next prime is 22681271. The reversal of 22681218 is 81218622.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 211921 + ... + 212027.

It is an arithmetic number, because the mean of its divisors is an integer number (842400).

Almost surely, 2^22681218 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22681218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26956800).

22681218 is an abundant number, since it is smaller than the sum of its proper divisors (31232382).

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

22681218 is a wasteful number, since it uses less digits than its factorization.

22681218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236 (or 222 counting only the distinct ones).

The product of its digits is 3072, while the sum is 30.

The square root of 22681218 is about 4762.4802361795. The cubic root of 22681218 is about 283.0667058811.

It can be divided in two parts, 2268 and 1218, that added together give a triangular number (3486 = T₈₃).

The spelling of 22681218 in words is "twenty-two million, six hundred eighty-one thousand, two hundred eighteen".