27988100 has 36 divisors (see below), whose sum is σ = 69412224. Its totient is φ = 9595680.

The previous prime is 27988099. The next prime is 27988109. The reversal of 27988100 is 188972.

It is a happy number.

It is a super-2 number, since 2×27988100² = 1566667483220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (27988109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19292 + ... + 20691.

Almost surely, 2^27988100 is an apocalyptic number.

27988100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27988100 is an abundant number, since it is smaller than the sum of its proper divisors (41424124).

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

27988100 is a wasteful number, since it uses less digits than its factorization.

27988100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40004 (or 39997 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 27988100 is about 5290.3780583244. The cubic root of 27988100 is about 303.6158727481.

The spelling of 27988100 in words is "twenty-seven million, nine hundred eighty-eight thousand, one hundred".