28686992 has 20 divisors (see below), whose sum is σ = 56631420. Its totient is φ = 14072448.

The previous prime is 28686991. The next prime is 28687013. The reversal of 28686992 is 29968682.

It can be written as a sum of positive squares in 2 ways, for example, as 20757136 + 7929856 = 4556^2 + 2816^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28686992.

It is not an unprimeable number, because it can be changed into a prime (28686991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16067 + ... + 17762.

It is an arithmetic number, because the mean of its divisors is an integer number (2831571).

Almost surely, 2^28686992 is an apocalyptic number.

It is an amenable number.

28686992 is a deficient number, since it is larger than the sum of its proper divisors (27944428).

28686992 is a wasteful number, since it uses less digits than its factorization.

28686992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33890 (or 33884 counting only the distinct ones).

The product of its digits is 746496, while the sum is 50.

The square root of 28686992 is about 5356.0238983783. The cubic root of 28686992 is about 306.1223256782.

It can be divided in two parts, 286 and 86992, that added together give a palindrome (87278).

The spelling of 28686992 in words is "twenty-eight million, six hundred eighty-six thousand, nine hundred ninety-two".