27655421 has 4 divisors (see below), whose sum is σ = 27671232. Its totient is φ = 27639612.

The previous prime is 27655409. The next prime is 27655429. The reversal of 27655421 is 12455672.

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 27655421 - 2¹⁸ = 27393277 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 (27655429) 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, 4901 + ... + 8906.

It is an arithmetic number, because the mean of its divisors is an integer number (6917808).

Almost surely, 2^27655421 is an apocalyptic number.

It is an amenable number.

27655421 is a deficient number, since it is larger than the sum of its proper divisors (15811).

27655421 is a wasteful number, since it uses less digits than its factorization.

27655421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15810.

The product of its digits is 16800, while the sum is 32.

The square root of 27655421 is about 5258.8421729502. The cubic root of 27655421 is about 302.4081035885.

The spelling of 27655421 in words is "twenty-seven million, six hundred fifty-five thousand, four hundred twenty-one".