28303286 has 8 divisors (see below), whose sum is σ = 46314504. Its totient is φ = 12865120.

The previous prime is 28303273. The next prime is 28303291. The reversal of 28303286 is 68230382.

It is a happy number.

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 643235 + ... + 643278.

It is an arithmetic number, because the mean of its divisors is an integer number (5789313).

Almost surely, 2^28303286 is an apocalyptic number.

28303286 is a deficient number, since it is larger than the sum of its proper divisors (18011218).

28303286 is a wasteful number, since it uses less digits than its factorization.

28303286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286526.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 28303286 is about 5320.0832700250. The cubic root of 28303286 is about 304.7513372320.

It can be divided in two parts, 2830 and 3286, that added together give a palindrome (6116).

The spelling of 28303286 in words is "twenty-eight million, three hundred three thousand, two hundred eighty-six".