28866618 has 80 divisors (see below), whose sum is σ = 71717184. Its totient is φ = 8605440.

The previous prime is 28866599. The next prime is 28866637. The reversal of 28866618 is 81666882.

It is an interprime number because it is at equal distance from previous prime (28866599) and next prime (28866637).

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 39 ways as a sum of consecutive naturals, for example, 172771 + ... + 172937.

Almost surely, 2^28866618 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28866618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35858592).

28866618 is an abundant number, since it is smaller than the sum of its proper divisors (42850566).

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

28866618 is a wasteful number, since it uses less digits than its factorization.

28866618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289 (or 280 counting only the distinct ones).

The product of its digits is 221184, while the sum is 45.

The square root of 28866618 is about 5372.7663265770. The cubic root of 28866618 is about 306.7599335620.

The spelling of 28866618 in words is "twenty-eight million, eight hundred sixty-six thousand, six hundred eighteen".