22172724 has 96 divisors (see below), whose sum is σ = 66483200. Its totient is φ = 6259680.

The previous prime is 22172701. The next prime is 22172729. The reversal of 22172724 is 42727122.

It is a Harshad number since it is a multiple of its sum of digits (27).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22172729) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 104979 + ... + 105189.

Almost surely, 2^22172724 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22172724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33241600).

22172724 is an abundant number, since it is smaller than the sum of its proper divisors (44310476).

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

22172724 is a wasteful number, since it uses less digits than its factorization.

22172724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370 (or 362 counting only the distinct ones).

The product of its digits is 3136, while the sum is 27.

The square root of 22172724 is about 4708.7922018284. The cubic root of 22172724 is about 280.9353245023.

Adding to 22172724 its reverse (42727122), we get a palindrome (64899846).

The spelling of 22172724 in words is "twenty-two million, one hundred seventy-two thousand, seven hundred twenty-four".