28111285 has 8 divisors (see below), whose sum is σ = 35717976. Its totient is φ = 21166080.

The previous prime is 28111271. The next prime is 28111331. The reversal of 28111285 is 58211182.

It can be written as a sum of positive squares in 4 ways, for example, as 643204 + 27468081 = 802^2 + 5241^2 .

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

It is not a de Polignac number, because 28111285 - 2¹⁹ = 27586997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165276 + ... + 165445.

It is an arithmetic number, because the mean of its divisors is an integer number (4464747).

Almost surely, 2^28111285 is an apocalyptic number.

It is an amenable number.

28111285 is a deficient number, since it is larger than the sum of its proper divisors (7606691).

28111285 is a wasteful number, since it uses less digits than its factorization.

28111285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330743.

The product of its digits is 1280, while the sum is 28.

The square root of 28111285 is about 5302.0076386214. The cubic root of 28111285 is about 304.0606592078.

It can be divided in two parts, 2811 and 1285, that added together give a 12-th power (4096 = 2¹²).

The spelling of 28111285 in words is "twenty-eight million, one hundred eleven thousand, two hundred eighty-five".