28018705 has 32 divisors (see below), whose sum is σ = 39916800. Its totient is φ = 18612480.

The previous prime is 28018681. The next prime is 28018717. The reversal of 28018705 is 50781082.

It is not a de Polignac number, because 28018705 - 2¹¹ = 28016657 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 106404 + ... + 106666.

It is an arithmetic number, because the mean of its divisors is an integer number (1247400).

Almost surely, 2^28018705 is an apocalyptic number.

It is an amenable number.

28018705 is a deficient number, since it is larger than the sum of its proper divisors (11898095).

28018705 is a wasteful number, since it uses less digits than its factorization.

28018705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 28018705 is about 5293.2697834137. The cubic root of 28018705 is about 303.7265004654.

Adding to 28018705 its reverse (50781082), we get a palindrome (78799787).

The spelling of 28018705 in words is "twenty-eight million, eighteen thousand, seven hundred five".