28214856 has 24 divisors (see below), whose sum is σ = 76415430. Its totient is φ = 9404928.

The previous prime is 28214843. The next prime is 28214873. The reversal of 28214856 is 65841282.

It can be written as a sum of positive squares in only one way, i.e., 23677956 + 4536900 = 4866^2 + 2130^2 .

It is a tau number, because it is divible by the number of its divisors (24).

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

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

It is a self number, because there is not a number n which added to its sum of digits gives 28214856.

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 5 ways as a sum of consecutive naturals, for example, 195865 + ... + 196008.

Almost surely, 2^28214856 is an apocalyptic number.

It is an amenable number.

28214856 is an abundant number, since it is smaller than the sum of its proper divisors (48200574).

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

28214856 is a wasteful number, since it uses less digits than its factorization.

28214856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391885 (or 391878 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 28214856 is about 5311.7658080906. The cubic root of 28214856 is about 304.4336205780.

The spelling of 28214856 in words is "twenty-eight million, two hundred fourteen thousand, eight hundred fifty-six".