28993686 has 8 divisors (see below), whose sum is σ = 57987384. Its totient is φ = 9664560.

The previous prime is 28993637. The next prime is 28993693. The reversal of 28993686 is 68639982.

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

28993686 is an admirable number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2416135 + ... + 2416146.

It is an arithmetic number, because the mean of its divisors is an integer number (7248423).

Almost surely, 2^28993686 is an apocalyptic number.

28993686 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.

28993686 is a wasteful number, since it uses less digits than its factorization.

28993686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4832286.

The product of its digits is 1119744, while the sum is 51.

The square root of 28993686 is about 5384.5785350387. The cubic root of 28993686 is about 307.2093836991.

The spelling of 28993686 in words is "twenty-eight million, nine hundred ninety-three thousand, six hundred eighty-six".