28120286 has 8 divisors (see below), whose sum is σ = 43541184. Its totient is φ = 13606560.

The previous prime is 28120273. The next prime is 28120289. The reversal of 28120286 is 68202182.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28120289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226715 + ... + 226838.

It is an arithmetic number, because the mean of its divisors is an integer number (5442648).

Almost surely, 2^28120286 is an apocalyptic number.

28120286 is a deficient number, since it is larger than the sum of its proper divisors (15420898).

28120286 is a wasteful number, since it uses less digits than its factorization.

28120286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453586.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 28120286 is about 5302.8564000923. The cubic root of 28120286 is about 304.0931083107.

The spelling of 28120286 in words is "twenty-eight million, one hundred twenty thousand, two hundred eighty-six".