22218788 has 24 divisors (see below), whose sum is σ = 40212480. Its totient is φ = 10735200.

The previous prime is 22218767. The next prime is 22218799. The reversal of 22218788 is 88781222.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16733 + ... + 18011.

It is an arithmetic number, because the mean of its divisors is an integer number (1675520).

Almost surely, 2^22218788 is an apocalyptic number.

It is an amenable number.

22218788 is a deficient number, since it is larger than the sum of its proper divisors (17993692).

22218788 is a wasteful number, since it uses less digits than its factorization.

22218788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1427 (or 1425 counting only the distinct ones).

The product of its digits is 28672, while the sum is 38.

The square root of 22218788 is about 4713.6809395631. The cubic root of 22218788 is about 281.1297383451.

The spelling of 22218788 in words is "twenty-two million, two hundred eighteen thousand, seven hundred eighty-eight".