27666989 has 8 divisors (see below), whose sum is σ = 31698240. Its totient is φ = 23655456.

The previous prime is 27666967. The next prime is 27667027. The reversal of 27666989 is 98966672.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27666989 is a prime.

It is a super-2 number, since 2×27666989² = 1530924560652242, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 27666989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27666589) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1784 + ... + 7649.

It is an arithmetic number, because the mean of its divisors is an integer number (3962280).

Almost surely, 2^27666989 is an apocalyptic number.

It is an amenable number.

27666989 is a deficient number, since it is larger than the sum of its proper divisors (4031251).

27666989 is an equidigital number, since it uses as much as digits as its factorization.

27666989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9859.

The product of its digits is 1959552, while the sum is 53.

The square root of 27666989 is about 5259.9419198314. The cubic root of 27666989 is about 302.4502625235.

The spelling of 27666989 in words is "twenty-seven million, six hundred sixty-six thousand, nine hundred eighty-nine".