28086556 has 12 divisors (see below), whose sum is σ = 49246120. Its totient is φ = 14016240.

The previous prime is 28086547. The next prime is 28086571. The reversal of 28086556 is 65568082.

It is a super-2 number, since 2×28086556² = 1577709255882272, which contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4326 + ... + 8653.

Almost surely, 2^28086556 is an apocalyptic number.

It is an amenable number.

28086556 is a deficient number, since it is larger than the sum of its proper divisors (21159564).

28086556 is a wasteful number, since it uses less digits than its factorization.

28086556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13524 (or 13522 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 40.

The square root of 28086556 is about 5299.6750843802. The cubic root of 28086556 is about 303.9714741239.

The spelling of 28086556 in words is "twenty-eight million, eighty-six thousand, five hundred fifty-six".