27078989 has 4 divisors (see below), whose sum is σ = 30947424. Its totient is φ = 23210556.

The previous prime is 27078967. The next prime is 27078991. The reversal of 27078989 is 98987072.

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 a de Polignac number, because none of the positive numbers 2^k-27078989 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27078959) 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, 1934207 + ... + 1934220.

It is an arithmetic number, because the mean of its divisors is an integer number (7736856).

Almost surely, 2^27078989 is an apocalyptic number.

It is an amenable number.

27078989 is a deficient number, since it is larger than the sum of its proper divisors (3868435).

27078989 is an equidigital number, since it uses as much as digits as its factorization.

27078989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3868434.

The product of its (nonzero) digits is 508032, while the sum is 50.

The square root of 27078989 is about 5203.7475918803. The cubic root of 27078989 is about 300.2922670260.

The spelling of 27078989 in words is "twenty-seven million, seventy-eight thousand, nine hundred eighty-nine".