28086984 has 24 divisors (see below), whose sum is σ = 76069110. Its totient is φ = 9362304.

The previous prime is 28086983. The next prime is 28086991. The reversal of 28086984 is 48968082.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20958084 + 7128900 = 4578^2 + 2670^2 .

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

It is not an unprimeable number, because it can be changed into a prime (28086983) 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, 194977 + ... + 195120.

Almost surely, 2^28086984 is an apocalyptic number.

28086984 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28086984 is an abundant number, since it is smaller than the sum of its proper divisors (47982126).

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

28086984 is a wasteful number, since it uses less digits than its factorization.

28086984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390109 (or 390102 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The square root of 28086984 is about 5299.7154640603. The cubic root of 28086984 is about 303.9730181501.

The spelling of 28086984 in words is "twenty-eight million, eighty-six thousand, nine hundred eighty-four".