28220228 has 12 divisors (see below), whose sum is σ = 50081472. Its totient is φ = 13911240.

The previous prime is 28220191. The next prime is 28220273. The reversal of 28220228 is 82202282.

It is a junction number, because it is equal to n+sod(n) for n = 28220197 and 28220206.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49400 + ... + 49967.

It is an arithmetic number, because the mean of its divisors is an integer number (4173456).

Almost surely, 2^28220228 is an apocalyptic number.

It is an amenable number.

28220228 is a deficient number, since it is larger than the sum of its proper divisors (21861244).

28220228 is a wasteful number, since it uses less digits than its factorization.

28220228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99442 (or 99440 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 26.

The square root of 28220228 is about 5312.2714539075. The cubic root of 28220228 is about 304.4529403485.

The spelling of 28220228 in words is "twenty-eight million, two hundred twenty thousand, two hundred twenty-eight".