27087981 has 4 divisors (see below), whose sum is σ = 36117312. Its totient is φ = 18058652.

The previous prime is 27087971. The next prime is 27087989. The reversal of 27087981 is 18978072.

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 27087981 - 2²² = 22893677 is a prime.

It is a super-2 number, since 2×27087981² = 1467517429312722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27087989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4514661 + ... + 4514666.

It is an arithmetic number, because the mean of its divisors is an integer number (9029328).

Almost surely, 2^27087981 is an apocalyptic number.

It is an amenable number.

27087981 is a deficient number, since it is larger than the sum of its proper divisors (9029331).

27087981 is an equidigital number, since it uses as much as digits as its factorization.

27087981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9029330.

The product of its (nonzero) digits is 56448, while the sum is 42.

The square root of 27087981 is about 5204.6115128797. The cubic root of 27087981 is about 300.3255022554.

The spelling of 27087981 in words is "twenty-seven million, eighty-seven thousand, nine hundred eighty-one".