28624228 has 12 divisors (see below), whose sum is σ = 50727040. Its totient is φ = 14130792.

The previous prime is 28624223. The next prime is 28624231. The reversal of 28624228 is 82242682.

It is a junction number, because it is equal to n+sod(n) for n = 28624193 and 28624202.

It is not an unprimeable number, because it can be changed into a prime (28624223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44976 + ... + 45607.

Almost surely, 2^28624228 is an apocalyptic number.

It is an amenable number.

28624228 is a deficient number, since it is larger than the sum of its proper divisors (22102812).

28624228 is a wasteful number, since it uses less digits than its factorization.

28624228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90666 (or 90664 counting only the distinct ones).

The product of its digits is 24576, while the sum is 34.

The square root of 28624228 is about 5350.1614928897. The cubic root of 28624228 is about 305.8989086091.

The spelling of 28624228 in words is "twenty-eight million, six hundred twenty-four thousand, two hundred twenty-eight".