27997885 has 4 divisors (see below), whose sum is σ = 33597468. Its totient is φ = 22398304.

The previous prime is 27997883. The next prime is 27997891. The reversal of 27997885 is 58879972.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20169081 + 7828804 = 4491^2 + 2798^2 .

It is a cyclic number.

It is not a de Polignac number, because 27997885 - 2¹ = 27997883 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 (27997883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2799784 + ... + 2799793.

It is an arithmetic number, because the mean of its divisors is an integer number (8399367).

Almost surely, 2^27997885 is an apocalyptic number.

It is an amenable number.

27997885 is a deficient number, since it is larger than the sum of its proper divisors (5599583).

27997885 is an equidigital number, since it uses as much as digits as its factorization.

27997885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5599582.

The product of its digits is 2540160, while the sum is 55.

The square root of 27997885 is about 5291.3027696400. The cubic root of 27997885 is about 303.6512512978.

It can be divided in two parts, 27997 and 885, that added together give a palindrome (28882).

The spelling of 27997885 in words is "twenty-seven million, nine hundred ninety-seven thousand, eight hundred eighty-five".