27916989 has 8 divisors (see below), whose sum is σ = 37552512. Its totient is φ = 18446400.

The previous prime is 27916979. The next prime is 27917033. The reversal of 27916989 is 98961972.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 27916989 - 2⁹ = 27916477 is a prime.

It is a super-2 number, since 2×27916989² = 1558716549652242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27916939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40837 + ... + 41514.

It is an arithmetic number, because the mean of its divisors is an integer number (4694064).

Almost surely, 2^27916989 is an apocalyptic number.

It is an amenable number.

27916989 is a deficient number, since it is larger than the sum of its proper divisors (9635523).

27916989 is a wasteful number, since it uses less digits than its factorization.

27916989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82467.

The product of its digits is 489888, while the sum is 51.

The square root of 27916989 is about 5283.6529976901. The cubic root of 27916989 is about 303.3585164724.

The spelling of 27916989 in words is "twenty-seven million, nine hundred sixteen thousand, nine hundred eighty-nine".