22788728 has 32 divisors (see below), whose sum is σ = 44206560. Its totient is φ = 11007360.

The previous prime is 22788713. The next prime is 22788737. The reversal of 22788728 is 82788722.

It is a happy number.

It is a super-2 number, since 2×22788728² = 1038652247715968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29726 + ... + 30482.

It is an arithmetic number, because the mean of its divisors is an integer number (1381455).

Almost surely, 2^22788728 is an apocalyptic number.

It is an amenable number.

22788728 is a deficient number, since it is larger than the sum of its proper divisors (21417832).

22788728 is a wasteful number, since it uses less digits than its factorization.

22788728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887 (or 883 counting only the distinct ones).

The product of its digits is 200704, while the sum is 44.

The square root of 22788728 is about 4773.7540782910. The cubic root of 22788728 is about 283.5132507412.

It can be divided in two parts, 227887 and 28, that multiplied together give a palindrome (6380836).

The spelling of 22788728 in words is "twenty-two million, seven hundred eighty-eight thousand, seven hundred twenty-eight".