22785228 has 18 divisors (see below), whose sum is σ = 57596084. Its totient is φ = 7595064.

The previous prime is 22785211. The next prime is 22785241. The reversal of 22785228 is 82258722.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 632923 = 22785228 / (2 + 2 + 7 + 8 + 5 + 2 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 22785192 and 22785201.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 316426 + ... + 316497.

Almost surely, 2^22785228 is an apocalyptic number.

It is an amenable number.

22785228 is an abundant number, since it is smaller than the sum of its proper divisors (34810856).

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

22785228 is a wasteful number, since it uses less digits than its factorization.

22785228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632933 (or 632928 counting only the distinct ones).

The product of its digits is 35840, while the sum is 36.

The square root of 22785228 is about 4773.3874764155. The cubic root of 22785228 is about 283.4987355654.

The spelling of 22785228 in words is "twenty-two million, seven hundred eighty-five thousand, two hundred twenty-eight".