27708991 has 8 divisors (see below), whose sum is σ = 28396800. Its totient is φ = 27025368.

The previous prime is 27708977. The next prime is 27709001. The reversal of 27708991 is 19980772.

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 27708991 - 2¹⁵ = 27676223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27708911) 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, 15460 + ... + 17158.

It is an arithmetic number, because the mean of its divisors is an integer number (3549600).

Almost surely, 2^27708991 is an apocalyptic number.

27708991 is a deficient number, since it is larger than the sum of its proper divisors (687809).

27708991 is a wasteful number, since it uses less digits than its factorization.

27708991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2093.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 27708991 is about 5263.9330352883. The cubic root of 27708991 is about 302.6032377633.

The spelling of 27708991 in words is "twenty-seven million, seven hundred eight thousand, nine hundred ninety-one".