28216266 has 16 divisors (see below), whose sum is σ = 60773664. Its totient is φ = 8681904.

The previous prime is 28216259. The next prime is 28216283. The reversal of 28216266 is 66261282.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180796 + ... + 180951.

It is an arithmetic number, because the mean of its divisors is an integer number (3798354).

Almost surely, 2^28216266 is an apocalyptic number.

28216266 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28216266 is an abundant number, since it is smaller than the sum of its proper divisors (32557398).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28216266 is a wasteful number, since it uses less digits than its factorization.

28216266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361765.

The product of its digits is 13824, while the sum is 33.

The square root of 28216266 is about 5311.8985306574. The cubic root of 28216266 is about 304.4386917157.

It can be divided in two parts, 28216 and 266, that added together give a palindrome (28482).

The spelling of 28216266 in words is "twenty-eight million, two hundred sixteen thousand, two hundred sixty-six".