27776221 has 8 divisors (see below), whose sum is σ = 30456000. Its totient is φ = 25122240.

The previous prime is 27776213. The next prime is 27776261. The reversal of 27776221 is 12267772.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 27776221 - 2³ = 27776213 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 (27776261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4156 + ... + 8533.

It is an arithmetic number, because the mean of its divisors is an integer number (3807000).

Almost surely, 2^27776221 is an apocalyptic number.

It is an amenable number.

27776221 is a deficient number, since it is larger than the sum of its proper divisors (2679779).

27776221 is a wasteful number, since it uses less digits than its factorization.

27776221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12899.

The product of its digits is 16464, while the sum is 34.

The square root of 27776221 is about 5270.3150759703. The cubic root of 27776221 is about 302.8477743271.

It can be divided in two parts, 2777 and 6221, that added together give a palindrome (8998).

The spelling of 27776221 in words is "twenty-seven million, seven hundred seventy-six thousand, two hundred twenty-one".