28500018 has 8 divisors (see below), whose sum is σ = 57000048. Its totient is φ = 9500004.

The previous prime is 28499971. The next prime is 28500023. The reversal of 28500018 is 81000582.

It is a sphenic number, since it is the product of 3 distinct primes.

28500018 is an admirable number.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2374996 + ... + 2375007.

It is an arithmetic number, because the mean of its divisors is an integer number (7125006).

Almost surely, 2^28500018 is an apocalyptic number.

28500018 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28500018 is a wasteful number, since it uses less digits than its factorization.

28500018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4750008.

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 28500018 is about 5338.5408118699. The cubic root of 28500018 is about 305.4558015209.

The spelling of 28500018 in words is "twenty-eight million, five hundred thousand, eighteen".