22142772 has 72 divisors (see below), whose sum is σ = 60035976. Its totient is φ = 6856704.

The previous prime is 22142749. The next prime is 22142797. The reversal of 22142772 is 27724122.

It can be written as a sum of positive squares in 4 ways, for example, as 5788836 + 16353936 = 2406^2 + 4044^2 .

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, 59178 + ... + 59550.

It is an arithmetic number, because the mean of its divisors is an integer number (833833).

Almost surely, 2^22142772 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 22142772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30017988).

22142772 is an abundant number, since it is smaller than the sum of its proper divisors (37893204).

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

22142772 is a wasteful number, since it uses less digits than its factorization.

22142772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497 (or 492 counting only the distinct ones).

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

The square root of 22142772 is about 4705.6106936295. The cubic root of 22142772 is about 280.8087671064.

Adding to 22142772 its reverse (27724122), we get a palindrome (49866894).

The spelling of 22142772 in words is "twenty-two million, one hundred forty-two thousand, seven hundred seventy-two".