27564421 has 4 divisors (see below), whose sum is σ = 29015200. Its totient is φ = 26113644.

The previous prime is 27564391. The next prime is 27564431. The reversal of 27564421 is 12446572.

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 27564421 - 2⁹ = 27563909 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 (27564431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 725361 + ... + 725398.

It is an arithmetic number, because the mean of its divisors is an integer number (7253800).

Almost surely, 2^27564421 is an apocalyptic number.

It is an amenable number.

27564421 is a deficient number, since it is larger than the sum of its proper divisors (1450779).

27564421 is a wasteful number, since it uses less digits than its factorization.

27564421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1450778.

The product of its digits is 13440, while the sum is 31.

The square root of 27564421 is about 5250.1829491933. The cubic root of 27564421 is about 302.0760484183.

The spelling of 27564421 in words is "twenty-seven million, five hundred sixty-four thousand, four hundred twenty-one".