28217266 has 48 divisors (see below), whose sum is σ = 54584640. Its totient is φ = 10627200.

The previous prime is 28217257. The next prime is 28217327. The reversal of 28217266 is 66271282.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 258820 + ... + 258928.

It is an arithmetic number, because the mean of its divisors is an integer number (1137180).

Almost surely, 2^28217266 is an apocalyptic number.

28217266 is a deficient number, since it is larger than the sum of its proper divisors (26367374).

28217266 is a wasteful number, since it uses less digits than its factorization.

28217266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211 (or 170 counting only the distinct ones).

The product of its digits is 16128, while the sum is 34.

The square root of 28217266 is about 5311.9926581275. The cubic root of 28217266 is about 304.4422881648.

The spelling of 28217266 in words is "twenty-eight million, two hundred seventeen thousand, two hundred sixty-six".