28715286 has 8 divisors (see below), whose sum is σ = 57430584. Its totient is φ = 9571760.

The previous prime is 28715263. The next prime is 28715299. The reversal of 28715286 is 68251782.

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

28715286 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2392935 + ... + 2392946.

It is an arithmetic number, because the mean of its divisors is an integer number (7178823).

Almost surely, 2^28715286 is an apocalyptic number.

28715286 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28715286 is a wasteful number, since it uses less digits than its factorization.

28715286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4785886.

The product of its digits is 53760, while the sum is 39.

The square root of 28715286 is about 5358.6645724471. The cubic root of 28715286 is about 306.2229354953. Note that the first 3 decimals are identical.

The spelling of 28715286 in words is "twenty-eight million, seven hundred fifteen thousand, two hundred eighty-six".