27805993 has 8 divisors (see below), whose sum is σ = 28562688. Its totient is φ = 27054384.

The previous prime is 27805991. The next prime is 27806021. The reversal of 27805993 is 39950872.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27805993 - 2¹ = 27805991 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27805991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11496 + ... + 13702.

It is an arithmetic number, because the mean of its divisors is an integer number (3570336).

Almost surely, 2^27805993 is an apocalyptic number.

It is an amenable number.

27805993 is a deficient number, since it is larger than the sum of its proper divisors (756695).

27805993 is a wasteful number, since it uses less digits than its factorization.

27805993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2543.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 27805993 is about 5273.1388185786. The cubic root of 27805993 is about 302.9559383624.

The spelling of 27805993 in words is "twenty-seven million, eight hundred five thousand, nine hundred ninety-three".