28656216 has 48 divisors (see below), whose sum is σ = 77861160. Its totient is φ = 9521280.

The previous prime is 28656197. The next prime is 28656227. The reversal of 28656216 is 61265682.

28656216 is a `hidden beast` number, since 2 + 86 + 562 + 16 = 666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 11 ways as a sum of consecutive naturals, for example, 37276 + ... + 38036.

Almost surely, 2^28656216 is an apocalyptic number.

It is an amenable number.

28656216 is an abundant number, since it is smaller than the sum of its proper divisors (49204944).

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

28656216 is a wasteful number, since it uses less digits than its factorization.

28656216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296 (or 1289 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 28656216 is about 5353.1501006417. The cubic root of 28656216 is about 306.0128150471.

The spelling of 28656216 in words is "twenty-eight million, six hundred fifty-six thousand, two hundred sixteen".