28633228 has 48 divisors (see below), whose sum is σ = 57725920. Its totient is φ = 12317184.

The previous prime is 28633223. The next prime is 28633249. The reversal of 28633228 is 82233682.

It is a junction number, because it is equal to n+sod(n) for n = 28633193 and 28633202.

It is not an unprimeable number, because it can be changed into a prime (28633223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71926 + ... + 72322.

Almost surely, 2^28633228 is an apocalyptic number.

It is an amenable number.

28633228 is an abundant number, since it is smaller than the sum of its proper divisors (29092692).

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

28633228 is a wasteful number, since it uses less digits than its factorization.

28633228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506 (or 504 counting only the distinct ones).

The product of its digits is 27648, while the sum is 34.

The square root of 28633228 is about 5351.0025228923. The cubic root of 28633228 is about 305.9309653885.

The spelling of 28633228 in words is "twenty-eight million, six hundred thirty-three thousand, two hundred twenty-eight".