28287886 has 8 divisors (see below), whose sum is σ = 46289304. Its totient is φ = 12858120.

The previous prime is 28287877. The next prime is 28287913. The reversal of 28287886 is 68878282.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 642885 + ... + 642928.

It is an arithmetic number, because the mean of its divisors is an integer number (5786163).

Almost surely, 2^28287886 is an apocalyptic number.

28287886 is a deficient number, since it is larger than the sum of its proper divisors (18001418).

28287886 is a wasteful number, since it uses less digits than its factorization.

28287886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1285826.

The product of its digits is 688128, while the sum is 49.

The square root of 28287886 is about 5318.6357273271. The cubic root of 28287886 is about 304.6960548166.

The spelling of 28287886 in words is "twenty-eight million, two hundred eighty-seven thousand, eight hundred eighty-six".