22172766 has 48 divisors (see below), whose sum is σ = 55719552. Its totient is φ = 5757840.

The previous prime is 22172749. The next prime is 22172771. The reversal of 22172766 is 66727122.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2901 + ... + 7263.

It is an arithmetic number, because the mean of its divisors is an integer number (1160824).

Almost surely, 2^22172766 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22172766, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27859776).

22172766 is an abundant number, since it is smaller than the sum of its proper divisors (33546786).

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

22172766 is a wasteful number, since it uses less digits than its factorization.

22172766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4397 (or 4386 counting only the distinct ones).

The product of its digits is 14112, while the sum is 33.

The square root of 22172766 is about 4708.7966615686. The cubic root of 22172766 is about 280.9355018865.

Adding to 22172766 its reverse (66727122), we get a palindrome (88899888).

The spelling of 22172766 in words is "twenty-two million, one hundred seventy-two thousand, seven hundred sixty-six".