28665018 has 48 divisors (see below), whose sum is σ = 65534976. Its totient is φ = 9041760.

The previous prime is 28664981. The next prime is 28665019. The reversal of 28665018 is 81056682.

It is a happy number.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28665019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25680 + ... + 26772.

It is an arithmetic number, because the mean of its divisors is an integer number (1365312).

Almost surely, 2^28665018 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28665018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32767488).

28665018 is an abundant number, since it is smaller than the sum of its proper divisors (36869958).

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

28665018 is a wasteful number, since it uses less digits than its factorization.

28665018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1179 (or 1176 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 28665018 is about 5353.9721702676. The cubic root of 28665018 is about 306.0441433176.

The spelling of 28665018 in words is "twenty-eight million, six hundred sixty-five thousand, eighteen".