28365666 has 32 divisors (see below), whose sum is σ = 65940480. Its totient is φ = 7966416.

The previous prime is 28365641. The next prime is 28365677. The reversal of 28365666 is 66656382.

It is a super-2 number, since 2×28365666² = 1609222015247112, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3246 + ... + 8201.

It is an arithmetic number, because the mean of its divisors is an integer number (2060640).

Almost surely, 2^28365666 is an apocalyptic number.

28365666 is an abundant number, since it is smaller than the sum of its proper divisors (37574814).

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

28365666 is a wasteful number, since it uses less digits than its factorization.

28365666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11518.

The product of its digits is 311040, while the sum is 42.

The square root of 28365666 is about 5325.9427334510. The cubic root of 28365666 is about 304.9750620119.

The spelling of 28365666 in words is "twenty-eight million, three hundred sixty-five thousand, six hundred sixty-six".