27808984 has 64 divisors (see below), whose sum is σ = 62576640. Its totient is φ = 11335680.

The previous prime is 27808973. The next prime is 27809009. The reversal of 27808984 is 48980872.

It is a super-2 number, since 2×27808984² = 1546679182224512, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143992 + ... + 144184.

It is an arithmetic number, because the mean of its divisors is an integer number (977760).

Almost surely, 2^27808984 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27808984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31288320).

27808984 is an abundant number, since it is smaller than the sum of its proper divisors (34767656).

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

27808984 is a wasteful number, since it uses less digits than its factorization.

27808984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320 (or 316 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 46.

The square root of 27808984 is about 5273.4224181266. The cubic root of 27808984 is about 302.9668006337.

The spelling of 27808984 in words is "twenty-seven million, eight hundred eight thousand, nine hundred eighty-four".