27981289 has 12 divisors (see below), whose sum is σ = 32453824. Its totient is φ = 23630544.

The previous prime is 27981263. The next prime is 27981293. The reversal of 27981289 is 98218972.

It is not a de Polignac number, because 27981289 - 2¹⁵ = 27948521 is a prime.

It is a Duffinian number.

Its product of digits (145152) is a multiple of the sum of its prime factors (504).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27681289) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141939 + ... + 142135.

Almost surely, 2^27981289 is an apocalyptic number.

It is an amenable number.

27981289 is a deficient number, since it is larger than the sum of its proper divisors (4472535).

27981289 is an equidigital number, since it uses as much as digits as its factorization.

27981289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504 (or 307 counting only the distinct ones).

The product of its digits is 145152, while the sum is 46.

The square root of 27981289 is about 5289.7343033464. The cubic root of 27981289 is about 303.5912420958.

The spelling of 27981289 in words is "twenty-seven million, nine hundred eighty-one thousand, two hundred eighty-nine".