27987533 has 4 divisors (see below), whose sum is σ = 31985760. Its totient is φ = 23989308.

The previous prime is 27987529. The next prime is 27987541. The reversal of 27987533 is 33578972.

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 not a de Polignac number, because 27987533 - 2² = 27987529 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27987433) 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, 1999103 + ... + 1999116.

It is an arithmetic number, because the mean of its divisors is an integer number (7996440).

Almost surely, 2^27987533 is an apocalyptic number.

It is an amenable number.

27987533 is a deficient number, since it is larger than the sum of its proper divisors (3998227).

27987533 is an equidigital number, since it uses as much as digits as its factorization.

27987533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3998226.

The product of its digits is 317520, while the sum is 44.

The square root of 27987533 is about 5290.3244702003. The cubic root of 27987533 is about 303.6138224557.

The spelling of 27987533 in words is "twenty-seven million, nine hundred eighty-seven thousand, five hundred thirty-three".