28086965 has 16 divisors (see below), whose sum is σ = 34774272. Its totient is φ = 21766464.

The previous prime is 28086953. The next prime is 28086973. The reversal of 28086965 is 56968082.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28086965 - 2¹⁸ = 27824821 is a prime.

It is a super-2 number, since 2×28086965² = 1577755205822450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24587 + ... + 25703.

It is an arithmetic number, because the mean of its divisors is an integer number (2173392).

Almost surely, 2^28086965 is an apocalyptic number.

It is an amenable number.

28086965 is a deficient number, since it is larger than the sum of its proper divisors (6687307).

28086965 is a wasteful number, since it uses less digits than its factorization.

28086965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1276.

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 28086965 is about 5299.7136715109. The cubic root of 28086965 is about 303.9729496072.

The spelling of 28086965 in words is "twenty-eight million, eighty-six thousand, nine hundred sixty-five".