28086957 has 12 divisors (see below), whose sum is σ = 40617564. Its totient is φ = 18702720.

The previous prime is 28086953. The next prime is 28086973. The reversal of 28086957 is 75968082.

It can be written as a sum of positive squares in 2 ways, for example, as 6380676 + 21706281 = 2526^2 + 4659^2 .

It is not a de Polignac number, because 28086957 - 2² = 28086953 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28086953) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 11103 + ... + 13395.

It is an arithmetic number, because the mean of its divisors is an integer number (3384797).

Almost surely, 2^28086957 is an apocalyptic number.

It is an amenable number.

28086957 is a deficient number, since it is larger than the sum of its proper divisors (12530607).

28086957 is a wasteful number, since it uses less digits than its factorization.

28086957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3660 (or 3657 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 28086957 is about 5299.7129167531. The cubic root of 28086957 is about 303.9729207470.

The spelling of 28086957 in words is "twenty-eight million, eighty-six thousand, nine hundred fifty-seven".