28286236 has 12 divisors (see below), whose sum is σ = 54001080. Its totient is φ = 12857360.

The previous prime is 28286233. The next prime is 28286239. The reversal of 28286236 is 63268282.

It is an interprime number because it is at equal distance from previous prime (28286233) and next prime (28286239).

It is a super-2 number, since 2×28286236² = 1600222294095392, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28286195 and 28286204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28286233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321391 + ... + 321478.

It is an arithmetic number, because the mean of its divisors is an integer number (4500090).

Almost surely, 2^28286236 is an apocalyptic number.

It is an amenable number.

28286236 is a deficient number, since it is larger than the sum of its proper divisors (25714844).

28286236 is a wasteful number, since it uses less digits than its factorization.

28286236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642884 (or 642882 counting only the distinct ones).

The product of its digits is 55296, while the sum is 37.

The square root of 28286236 is about 5318.4806100991. The cubic root of 28286236 is about 304.6901305107.

The spelling of 28286236 in words is "twenty-eight million, two hundred eighty-six thousand, two hundred thirty-six".