27993798 has 72 divisors (see below), whose sum is σ = 74746152. Its totient is φ = 7523712.

The previous prime is 27993773. The next prime is 27993839. The reversal of 27993798 is 89739972.

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 35 ways as a sum of consecutive naturals, for example, 14061 + ... + 15927.

It is an arithmetic number, because the mean of its divisors is an integer number (1038141).

Almost surely, 2^27993798 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27993798, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37373076).

27993798 is an abundant number, since it is smaller than the sum of its proper divisors (46752354).

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

27993798 is a wasteful number, since it uses less digits than its factorization.

27993798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1906 (or 1896 counting only the distinct ones).

The product of its digits is 1714608, while the sum is 54.

The square root of 27993798 is about 5290.9165557586. The cubic root of 27993798 is about 303.6364753834.

The spelling of 27993798 in words is "twenty-seven million, nine hundred ninety-three thousand, seven hundred ninety-eight".