28855691 has 8 divisors (see below), whose sum is σ = 29490480. Its totient is φ = 28224352.

The previous prime is 28855663. The next prime is 28855741. The reversal of 28855691 is 19655882.

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

It is a cyclic number.

It is not a de Polignac number, because 28855691 - 2¹⁰ = 28854667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28855621) 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 7 ways as a sum of consecutive naturals, for example, 22865 + ... + 24093.

It is an arithmetic number, because the mean of its divisors is an integer number (3686310).

Almost surely, 2^28855691 is an apocalyptic number.

28855691 is a deficient number, since it is larger than the sum of its proper divisors (634789).

28855691 is a wasteful number, since it uses less digits than its factorization.

28855691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725.

The product of its digits is 172800, while the sum is 44.

The square root of 28855691 is about 5371.7493426257. The cubic root of 28855691 is about 306.7212223094.

The spelling of 28855691 in words is "twenty-eight million, eight hundred fifty-five thousand, six hundred ninety-one".