27557891 has 4 divisors (see below), whose sum is σ = 27700872. Its totient is φ = 27414912.

The previous prime is 27557879. The next prime is 27557903. The reversal of 27557891 is 19875572.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (27557879) and next prime (27557903).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27557891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27557821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71201 + ... + 71586.

It is an arithmetic number, because the mean of its divisors is an integer number (6925218).

Almost surely, 2^27557891 is an apocalyptic number.

27557891 is a deficient number, since it is larger than the sum of its proper divisors (142981).

27557891 is a wasteful number, since it uses less digits than its factorization.

27557891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142980.

The product of its digits is 176400, while the sum is 44.

The square root of 27557891 is about 5249.5610292671. The cubic root of 27557891 is about 302.0521926372.

The spelling of 27557891 in words is "twenty-seven million, five hundred fifty-seven thousand, eight hundred ninety-one".