28993086 has 16 divisors (see below), whose sum is σ = 64429200. Its totient is φ = 9664344.

The previous prime is 28993049. The next prime is 28993093. The reversal of 28993086 is 68039982.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268401 + ... + 268508.

It is an arithmetic number, because the mean of its divisors is an integer number (4026825).

Almost surely, 2^28993086 is an apocalyptic number.

28993086 is an abundant number, since it is smaller than the sum of its proper divisors (35436114).

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

28993086 is a wasteful number, since it uses less digits than its factorization.

28993086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536920 (or 536914 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 28993086 is about 5384.5228200835. The cubic root of 28993086 is about 307.2072645377.

The spelling of 28993086 in words is "twenty-eight million, nine hundred ninety-three thousand, eighty-six".