27989245 has 4 divisors (see below), whose sum is σ = 33587100. Its totient is φ = 22391392.

The previous prime is 27989239. The next prime is 27989251. The reversal of 27989245 is 54298972.

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

It is an interprime number because it is at equal distance from previous prime (27989239) and next prime (27989251).

It can be written as a sum of positive squares in 2 ways, for example, as 21734244 + 6255001 = 4662^2 + 2501^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27989245 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27989195 and 27989204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2798920 + ... + 2798929.

It is an arithmetic number, because the mean of its divisors is an integer number (8396775).

Almost surely, 2^27989245 is an apocalyptic number.

It is an amenable number.

27989245 is a deficient number, since it is larger than the sum of its proper divisors (5597855).

27989245 is an equidigital number, since it uses as much as digits as its factorization.

27989245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5597854.

The product of its digits is 362880, while the sum is 46.

The square root of 27989245 is about 5290.4862725462. The cubic root of 27989245 is about 303.6200130248.

It can be divided in two parts, 2798924 and 5, that added together give a square (2798929 = 1673²).

The spelling of 27989245 in words is "twenty-seven million, nine hundred eighty-nine thousand, two hundred forty-five".