27999440 has 40 divisors (see below), whose sum is σ = 74400000. Its totient is φ = 9599616.

The previous prime is 27999431. The next prime is 27999443. The reversal of 27999440 is 4499972.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 27999391 and 27999400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27999443) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 24440 + ... + 25559.

It is an arithmetic number, because the mean of its divisors is an integer number (1860000).

Almost surely, 2^27999440 is an apocalyptic number.

27999440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27999440 is an abundant number, since it is smaller than the sum of its proper divisors (46400560).

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

27999440 is a wasteful number, since it uses less digits than its factorization.

27999440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50019 (or 50013 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 27999440 is about 5291.4497068384. The cubic root of 27999440 is about 303.6568727814.

The spelling of 27999440 in words is "twenty-seven million, nine hundred ninety-nine thousand, four hundred forty".