28678655 has 4 divisors (see below), whose sum is σ = 34414392. Its totient is φ = 22942920.

The previous prime is 28678649. The next prime is 28678667. The reversal of 28678655 is 55687682.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28678655 - 2⁶ = 28678591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2867861 + ... + 2867870.

It is an arithmetic number, because the mean of its divisors is an integer number (8603598).

Almost surely, 2^28678655 is an apocalyptic number.

28678655 is a deficient number, since it is larger than the sum of its proper divisors (5735737).

28678655 is an equidigital number, since it uses as much as digits as its factorization.

28678655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5735736.

The product of its digits is 806400, while the sum is 47.

The square root of 28678655 is about 5355.2455592624. The cubic root of 28678655 is about 306.0926677633.

The spelling of 28678655 in words is "twenty-eight million, six hundred seventy-eight thousand, six hundred fifty-five".