22788018 has 48 divisors (see below), whose sum is σ = 54654912. Its totient is φ = 6804000.

The previous prime is 22788013. The next prime is 22788037. The reversal of 22788018 is 81088722.

It is not an unprimeable number, because it can be changed into a prime (22788013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13248 + ... + 14868.

It is an arithmetic number, because the mean of its divisors is an integer number (1138644).

Almost surely, 2^22788018 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22788018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27327456).

22788018 is an abundant number, since it is smaller than the sum of its proper divisors (31866894).

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

22788018 is a wasteful number, since it uses less digits than its factorization.

22788018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1711 (or 1708 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 22788018 is about 4773.6797127583. The cubic root of 22788018 is about 283.5103063543.

It can be divided in two parts, 2278 and 8018, that added together give a triangular number (10296 = T₁₄₃).

The spelling of 22788018 in words is "twenty-two million, seven hundred eighty-eight thousand, eighteen".