27888813 has 16 divisors (see below), whose sum is σ = 42197760. Its totient is φ = 18196128.

The previous prime is 27888803. The next prime is 27888829. The reversal of 27888813 is 31888872.

It is a happy number.

It is not a de Polignac number, because 27888813 - 2⁸ = 27888557 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27888803) 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 15 ways as a sum of consecutive naturals, for example, 9720 + ... + 12257.

It is an arithmetic number, because the mean of its divisors is an integer number (2637360).

Almost surely, 2^27888813 is an apocalyptic number.

It is an amenable number.

27888813 is a deficient number, since it is larger than the sum of its proper divisors (14308947).

27888813 is a wasteful number, since it uses less digits than its factorization.

27888813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22033 (or 22027 counting only the distinct ones).

The product of its digits is 172032, while the sum is 45.

The square root of 27888813 is about 5280.9859874838. The cubic root of 27888813 is about 303.2564244363.

The spelling of 27888813 in words is "twenty-seven million, eight hundred eighty-eight thousand, eight hundred thirteen".