28678705 has 16 divisors (see below), whose sum is σ = 37652544. Its totient is φ = 20796480.

The previous prime is 28678697. The next prime is 28678717. The reversal of 28678705 is 50787682.

It is a happy number.

It is not a de Polignac number, because 28678705 - 2³ = 28678697 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 28267 + ... + 29263.

It is an arithmetic number, because the mean of its divisors is an integer number (2353284).

Almost surely, 2^28678705 is an apocalyptic number.

It is an amenable number.

28678705 is a deficient number, since it is larger than the sum of its proper divisors (8973839).

28678705 is a wasteful number, since it uses less digits than its factorization.

28678705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1536.

The product of its (nonzero) digits is 188160, while the sum is 43.

The square root of 28678705 is about 5355.2502275804. The cubic root of 28678705 is about 306.0928456496.

The spelling of 28678705 in words is "twenty-eight million, six hundred seventy-eight thousand, seven hundred five".