28086782 has 4 divisors (see below), whose sum is σ = 42130176. Its totient is φ = 14043390.

The previous prime is 28086743. The next prime is 28086803. The reversal of 28086782 is 28768082.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7021694 + ... + 7021697.

It is an arithmetic number, because the mean of its divisors is an integer number (10532544).

Almost surely, 2^28086782 is an apocalyptic number.

28086782 is a deficient number, since it is larger than the sum of its proper divisors (14043394).

28086782 is a wasteful number, since it uses less digits than its factorization.

28086782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14043393.

The product of its (nonzero) digits is 86016, while the sum is 41.

The square root of 28086782 is about 5299.6964063991. The cubic root of 28086782 is about 303.9722894294.

The spelling of 28086782 in words is "twenty-eight million, eighty-six thousand, seven hundred eighty-two".