27617989 has 4 divisors (see below), whose sum is σ = 31563424. Its totient is φ = 23672556.

The previous prime is 27617983. The next prime is 27618007. The reversal of 27617989 is 98971672.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 27617989 - 2⁷ = 27617861 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 (27617983) 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 3 ways as a sum of consecutive naturals, for example, 1972707 + ... + 1972720.

It is an arithmetic number, because the mean of its divisors is an integer number (7890856).

Almost surely, 2^27617989 is an apocalyptic number.

It is an amenable number.

27617989 is a deficient number, since it is larger than the sum of its proper divisors (3945435).

27617989 is an equidigital number, since it uses as much as digits as its factorization.

27617989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3945434.

The product of its digits is 381024, while the sum is 49.

The square root of 27617989 is about 5255.2820095595. The cubic root of 27617989 is about 302.2716041162.

The spelling of 27617989 in words is "twenty-seven million, six hundred seventeen thousand, nine hundred eighty-nine".