28381678 has 32 divisors (see below), whose sum is σ = 49416192. Its totient is φ = 12117600.

The previous prime is 28381673. The next prime is 28381693. The reversal of 28381678 is 87618382.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28381673) 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 15 ways as a sum of consecutive naturals, for example, 17773 + ... + 19303.

It is an arithmetic number, because the mean of its divisors is an integer number (1544256).

Almost surely, 2^28381678 is an apocalyptic number.

28381678 is a deficient number, since it is larger than the sum of its proper divisors (21034514).

28381678 is a wasteful number, since it uses less digits than its factorization.

28381678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1600.

The product of its digits is 129024, while the sum is 43.

The square root of 28381678 is about 5327.4457294279. The cubic root of 28381678 is about 305.0324358588.

The spelling of 28381678 in words is "twenty-eight million, three hundred eighty-one thousand, six hundred seventy-eight".