27804421 has 4 divisors (see below), whose sum is σ = 27871200. Its totient is φ = 27737644.

The previous prime is 27804409. The next prime is 27804431. The reversal of 27804421 is 12440872.

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 27804421 - 2⁵ = 27804389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27804421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27804431) 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, 32761 + ... + 33598.

It is an arithmetic number, because the mean of its divisors is an integer number (6967800).

Almost surely, 2^27804421 is an apocalyptic number.

It is an amenable number.

27804421 is a deficient number, since it is larger than the sum of its proper divisors (66779).

27804421 is an equidigital number, since it uses as much as digits as its factorization.

27804421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66778.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 27804421 is about 5272.9897591404. The cubic root of 27804421 is about 302.9502290930.

The spelling of 27804421 in words is "twenty-seven million, eight hundred four thousand, four hundred twenty-one".