27883561 has 4 divisors (see below), whose sum is σ = 27902800. Its totient is φ = 27864324.

The previous prime is 27883501. The next prime is 27883573. The reversal of 27883561 is 16538872.

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 27883561 - 2¹³ = 27875369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27883501) 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, 7251 + ... + 10408.

It is an arithmetic number, because the mean of its divisors is an integer number (6975700).

Almost surely, 2^27883561 is an apocalyptic number.

It is an amenable number.

27883561 is a deficient number, since it is larger than the sum of its proper divisors (19239).

27883561 is a wasteful number, since it uses less digits than its factorization.

27883561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19238.

The product of its digits is 80640, while the sum is 40.

The square root of 27883561 is about 5280.4887084436. The cubic root of 27883561 is about 303.2373869017.

The spelling of 27883561 in words is "twenty-seven million, eight hundred eighty-three thousand, five hundred sixty-one".