27999000 has 256 divisors, whose sum is σ = 104457600. Its totient is φ = 6912000.

The previous prime is 27998969. The next prime is 27999029. The reversal of 27999000 is 99972.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 63 ways as a sum of consecutive naturals, for example, 458970 + ... + 459030.

Almost surely, 2^27999000 is an apocalyptic number.

27999000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27999000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52228800).

27999000 is an abundant number, since it is smaller than the sum of its proper divisors (76458600).

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

27999000 is a wasteful number, since it uses less digits than its factorization.

27999000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108 (or 88 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 36.

The square root of 27999000 is about 5291.4081301672. The cubic root of 27999000 is about 303.6552821577.

The spelling of 27999000 in words is "twenty-seven million, nine hundred ninety-nine thousand".