28186146 has 12 divisors (see below), whose sum is σ = 61070022. Its totient is φ = 9395376.

The previous prime is 28186141. The next prime is 28186159. The reversal of 28186146 is 64168182.

28186146 is a `hidden beast` number, since 28 + 18 + 614 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21483225 + 6702921 = 4635^2 + 2589^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28186146.

It is not an unprimeable number, because it can be changed into a prime (28186141) by changing a digit.

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, 782931 + ... + 782966.

Almost surely, 2^28186146 is an apocalyptic number.

28186146 is an abundant number, since it is smaller than the sum of its proper divisors (32883876).

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

28186146 is a wasteful number, since it uses less digits than its factorization.

28186146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565905 (or 1565902 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 28186146 is about 5309.0626291277. The cubic root of 28186146 is about 304.3303268205.

The spelling of 28186146 in words is "twenty-eight million, one hundred eighty-six thousand, one hundred forty-six".