28715886 has 12 divisors (see below), whose sum is σ = 62217792. Its totient is φ = 9571956.

The previous prime is 28715849. The next prime is 28715909. The reversal of 28715886 is 68851782.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 797646 + ... + 797681.

It is an arithmetic number, because the mean of its divisors is an integer number (5184816).

Almost surely, 2^28715886 is an apocalyptic number.

28715886 is an abundant number, since it is smaller than the sum of its proper divisors (33501906).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28715886 is a wasteful number, since it uses less digits than its factorization.

28715886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1595335 (or 1595332 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 28715886 is about 5358.7205562522. The cubic root of 28715886 is about 306.2250683022.

The spelling of 28715886 in words is "twenty-eight million, seven hundred fifteen thousand, eight hundred eighty-six".