22142764 has 48 divisors (see below), whose sum is σ = 46303488. Its totient is φ = 9067968.

The previous prime is 22142749. The next prime is 22142797. The reversal of 22142764 is 46724122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63639 + ... + 63985.

It is an arithmetic number, because the mean of its divisors is an integer number (964656).

Almost surely, 2^22142764 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 22142764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23151744).

22142764 is an abundant number, since it is smaller than the sum of its proper divisors (24160724).

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

22142764 is a wasteful number, since it uses less digits than its factorization.

22142764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454 (or 452 counting only the distinct ones).

The product of its digits is 5376, while the sum is 28.

The square root of 22142764 is about 4705.6098435803. The cubic root of 22142764 is about 280.8087332884.

Adding to 22142764 its reverse (46724122), we get a palindrome (68866886).

The spelling of 22142764 in words is "twenty-two million, one hundred forty-two thousand, seven hundred sixty-four".