28105228 has 6 divisors (see below), whose sum is σ = 49184156. Its totient is φ = 14052612.

The previous prime is 28105183. The next prime is 28105229. The reversal of 28105228 is 82250182.

It is a junction number, because it is equal to n+sod(n) for n = 28105196 and 28105205.

It is not an unprimeable number, because it can be changed into a prime (28105229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3513150 + ... + 3513157.

Almost surely, 2^28105228 is an apocalyptic number.

It is an amenable number.

28105228 is a deficient number, since it is larger than the sum of its proper divisors (21078928).

28105228 is a wasteful number, since it uses less digits than its factorization.

28105228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7026311 (or 7026309 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 28105228 is about 5301.4364091254. The cubic root of 28105228 is about 304.0388194887.

The spelling of 28105228 in words is "twenty-eight million, one hundred five thousand, two hundred twenty-eight".