22166784 has 90 divisors (see below), whose sum is σ = 66159170. Its totient is φ = 7382016.

The previous prime is 22166741. The next prime is 22166789. The reversal of 22166784 is 48766122.

It can be written as a sum of positive squares in only one way, i.e., 18662400 + 3504384 = 4320^2 + 1872^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22166789) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 20202 + ... + 21270.

Almost surely, 2^22166784 is an apocalyptic number.

22166784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22166784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33079585).

22166784 is an abundant number, since it is smaller than the sum of its proper divisors (43992386).

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

22166784 is an equidigital number, since it uses as much as digits as its factorization.

22166784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1097 (or 1074 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 22166784 is about 4708.1614245903. The cubic root of 22166784 is about 280.9102350445.

The spelling of 22166784 in words is "twenty-two million, one hundred sixty-six thousand, seven hundred eighty-four".