28223788 has 12 divisors (see below), whose sum is σ = 49432600. Its totient is φ = 14100192.

The previous prime is 28223779. The next prime is 28223801. The reversal of 28223788 is 88732282.

It is a happy number.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28223788.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 4720 + ... + 8872.

Almost surely, 2^28223788 is an apocalyptic number.

It is an amenable number.

28223788 is a deficient number, since it is larger than the sum of its proper divisors (21208812).

28223788 is a wasteful number, since it uses less digits than its factorization.

28223788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5856 (or 5854 counting only the distinct ones).

The product of its digits is 86016, while the sum is 40.

The square root of 28223788 is about 5312.6065165792. The cubic root of 28223788 is about 304.4657421220.

The spelling of 28223788 in words is "twenty-eight million, two hundred twenty-three thousand, seven hundred eighty-eight".