22728456 has 96 divisors (see below), whose sum is σ = 67392000. Its totient is φ = 6888960.

The previous prime is 22728443. The next prime is 22728457. The reversal of 22728456 is 65482722.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 22728456.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22728457) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37645 + ... + 38243.

It is an arithmetic number, because the mean of its divisors is an integer number (702000).

Almost surely, 2^22728456 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 22728456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33696000).

22728456 is an abundant number, since it is smaller than the sum of its proper divisors (44663544).

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

22728456 is a wasteful number, since it uses less digits than its factorization.

22728456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659 (or 652 counting only the distinct ones).

The product of its digits is 53760, while the sum is 36.

The square root of 22728456 is about 4767.4370473033. The cubic root of 22728456 is about 283.2630832371.

The spelling of 22728456 in words is "twenty-two million, seven hundred twenty-eight thousand, four hundred fifty-six".