28689867 has 12 divisors (see below), whose sum is σ = 43622280. Its totient is φ = 18119808.

The previous prime is 28689851. The next prime is 28689889. The reversal of 28689867 is 76898682.

It is not a de Polignac number, because 28689867 - 2⁴ = 28689851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28689847) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83718 + ... + 84059.

It is an arithmetic number, because the mean of its divisors is an integer number (3635190).

Almost surely, 2^28689867 is an apocalyptic number.

28689867 is a deficient number, since it is larger than the sum of its proper divisors (14932413).

28689867 is a wasteful number, since it uses less digits than its factorization.

28689867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167802 (or 167799 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The square root of 28689867 is about 5356.2922810467. The cubic root of 28689867 is about 306.1325518263.

The spelling of 28689867 in words is "twenty-eight million, six hundred eighty-nine thousand, eight hundred sixty-seven".