28255666 has 16 divisors (see below), whose sum is σ = 45039456. Its totient is φ = 13248576.

The previous prime is 28255637. The next prime is 28255673. The reversal of 28255666 is 66655282.

It is a happy number.

It is a super-2 number, since 2×28255666² = 1596765322207112, which contains 22 as substring.

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, 9085 + ... + 11791.

It is an arithmetic number, because the mean of its divisors is an integer number (2814966).

Almost surely, 2^28255666 is an apocalyptic number.

28255666 is a deficient number, since it is larger than the sum of its proper divisors (16783790).

28255666 is a wasteful number, since it uses less digits than its factorization.

28255666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3033.

The product of its digits is 172800, while the sum is 40.

The square root of 28255666 is about 5315.6058920879. The cubic root of 28255666 is about 304.5803275807.

The spelling of 28255666 in words is "twenty-eight million, two hundred fifty-five thousand, six hundred sixty-six".