28678665 has 8 divisors (see below), whose sum is σ = 45885888. Its totient is φ = 15295280.

The previous prime is 28678649. The next prime is 28678667. The reversal of 28678665 is 56687682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28678665 - 2⁴ = 28678649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28678667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 955941 + ... + 955970.

It is an arithmetic number, because the mean of its divisors is an integer number (5735736).

Almost surely, 2^28678665 is an apocalyptic number.

It is an amenable number.

28678665 is a deficient number, since it is larger than the sum of its proper divisors (17207223).

28678665 is a wasteful number, since it uses less digits than its factorization.

28678665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911919.

The product of its digits is 967680, while the sum is 48.

The square root of 28678665 is about 5355.2464929264. The cubic root of 28678665 is about 306.0927033406.

The spelling of 28678665 in words is "twenty-eight million, six hundred seventy-eight thousand, six hundred sixty-five".