28686895 has 4 divisors (see below), whose sum is σ = 34424280. Its totient is φ = 22949512.

The previous prime is 28686893. The next prime is 28686899. The reversal of 28686895 is 59868682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 59868682 = 2 ⋅29934341.

It is a cyclic number.

It is not a de Polignac number, because 28686895 - 2¹ = 28686893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28686893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2868685 + ... + 2868694.

It is an arithmetic number, because the mean of its divisors is an integer number (8606070).

Almost surely, 2^28686895 is an apocalyptic number.

28686895 is a deficient number, since it is larger than the sum of its proper divisors (5737385).

28686895 is an equidigital number, since it uses as much as digits as its factorization.

28686895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5737384.

The product of its digits is 1658880, while the sum is 52.

The square root of 28686895 is about 5356.0148431460. The cubic root of 28686895 is about 306.1219806449.

The spelling of 28686895 in words is "twenty-eight million, six hundred eighty-six thousand, eight hundred ninety-five".