22279712 has 72 divisors (see below), whose sum is σ = 54999756. Its totient is φ = 8805888.

The previous prime is 22279703. The next prime is 22279717. The reversal of 22279712 is 21797222.

It can be written as a sum of positive squares in 2 ways, for example, as 21864976 + 414736 = 4676^2 + 644^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (22279717) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19838 + ... + 20930.

Almost surely, 2^22279712 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 22279712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27499878).

22279712 is an abundant number, since it is smaller than the sum of its proper divisors (32720044).

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

22279712 is a wasteful number, since it uses less digits than its factorization.

22279712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130 (or 1115 counting only the distinct ones).

The product of its digits is 7056, while the sum is 32.

The square root of 22279712 is about 4720.1389810047. The cubic root of 22279712 is about 281.3864567791.

The spelling of 22279712 in words is "twenty-two million, two hundred seventy-nine thousand, seven hundred twelve".