28118805 has 32 divisors (see below), whose sum is σ = 52859520. Its totient is φ = 12583680.

The previous prime is 28118801. The next prime is 28118809. The reversal of 28118805 is 50881182.

It is an interprime number because it is at equal distance from previous prime (28118801) and next prime (28118809).

It is not a de Polignac number, because 28118805 - 2² = 28118801 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28118801) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 4410 + ... + 8699.

It is an arithmetic number, because the mean of its divisors is an integer number (1651860).

Almost surely, 2^28118805 is an apocalyptic number.

It is an amenable number.

28118805 is a deficient number, since it is larger than the sum of its proper divisors (24740715).

28118805 is a wasteful number, since it uses less digits than its factorization.

28118805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13141.

The product of its (nonzero) digits is 5120, while the sum is 33.

The square root of 28118805 is about 5302.7167565315. The cubic root of 28118805 is about 304.0877696997.

Adding to 28118805 its reverse (50881182), we get a palindrome (78999987).

The spelling of 28118805 in words is "twenty-eight million, one hundred eighteen thousand, eight hundred five".