22780816 has 40 divisors (see below), whose sum is σ = 47534904. Its totient is φ = 10536960.

The previous prime is 22780811. The next prime is 22780817. The reversal of 22780816 is 61808722.

It can be written as a sum of positive squares in 4 ways, for example, as 6780816 + 16000000 = 2604^2 + 4000^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (22780811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15906 + ... + 17278.

Almost surely, 2^22780816 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 22780816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23767452).

22780816 is an abundant number, since it is smaller than the sum of its proper divisors (24754088).

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

22780816 is a wasteful number, since it uses less digits than its factorization.

22780816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1459 (or 1453 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 22780816 is about 4772.9253084455. The cubic root of 22780816 is about 283.4804360314.

The spelling of 22780816 in words is "twenty-two million, seven hundred eighty thousand, eight hundred sixteen".