27808245 has 32 divisors (see below), whose sum is σ = 51148800. Its totient is φ = 14317632.

The previous prime is 27808241. The next prime is 27808247. The reversal of 27808245 is 54280872.

It is a happy number.

It is not a de Polignac number, because 27808245 - 2² = 27808241 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27808241) 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 31 ways as a sum of consecutive naturals, for example, 364 + ... + 7466.

It is an arithmetic number, because the mean of its divisors is an integer number (1598400).

Almost surely, 2^27808245 is an apocalyptic number.

It is an amenable number.

27808245 is a deficient number, since it is larger than the sum of its proper divisors (23340555).

27808245 is a wasteful number, since it uses less digits than its factorization.

27808245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7146 (or 7140 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 27808245 is about 5273.3523493125. The cubic root of 27808245 is about 302.9641169153.

It can be divided in two parts, 2780 and 8245, that added together give a square (11025 = 105²).

The spelling of 27808245 in words is "twenty-seven million, eight hundred eight thousand, two hundred forty-five".