28169228 has 12 divisors (see below), whose sum is σ = 49494312. Its totient is φ = 14028000.

The previous prime is 28169209. The next prime is 28169231. The reversal of 28169228 is 82296182.

It is a super-2 number, since 2×28169228² = 1587010812231968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28169191 and 28169200.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13025 + ... + 15032.

It is an arithmetic number, because the mean of its divisors is an integer number (4124526).

Almost surely, 2^28169228 is an apocalyptic number.

It is an amenable number.

28169228 is a deficient number, since it is larger than the sum of its proper divisors (21325084).

28169228 is a wasteful number, since it uses less digits than its factorization.

28169228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28312 (or 28310 counting only the distinct ones).

The product of its digits is 27648, while the sum is 38.

The square root of 28169228 is about 5307.4690766881. The cubic root of 28169228 is about 304.2694258501.

The spelling of 28169228 in words is "twenty-eight million, one hundred sixty-nine thousand, two hundred twenty-eight".