28211856 has 20 divisors (see below), whose sum is σ = 72880752. Its totient is φ = 9403936.

The previous prime is 28211849. The next prime is 28211861. The reversal of 28211856 is 65811282.

It is a super-3 number, since 3×28211856³ (a number of 23 digits) contains 333 as substring.

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 3 ways as a sum of consecutive naturals, for example, 293826 + ... + 293921.

Almost surely, 2^28211856 is an apocalyptic number.

It is an amenable number.

28211856 is an abundant number, since it is smaller than the sum of its proper divisors (44668896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28211856 is a wasteful number, since it uses less digits than its factorization.

28211856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587758 (or 587752 counting only the distinct ones).

The product of its digits is 7680, while the sum is 33.

The square root of 28211856 is about 5311.4834086157. The cubic root of 28211856 is about 304.4228303613.

The spelling of 28211856 in words is "twenty-eight million, two hundred eleven thousand, eight hundred fifty-six".