27628221 has 8 divisors (see below), whose sum is σ = 38439360. Its totient is φ = 17617952.

The previous prime is 27628217. The next prime is 27628259. The reversal of 27628221 is 12282672.

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

It is a cyclic number.

It is not a de Polignac number, because 27628221 - 2² = 27628217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27621221) 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, 200136 + ... + 200273.

It is an arithmetic number, because the mean of its divisors is an integer number (4804920).

Almost surely, 2^27628221 is an apocalyptic number.

It is an amenable number.

27628221 is a deficient number, since it is larger than the sum of its proper divisors (10811139).

27628221 is a wasteful number, since it uses less digits than its factorization.

27628221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400435.

The product of its digits is 5376, while the sum is 30.

The square root of 27628221 is about 5256.2554161684. The cubic root of 27628221 is about 302.3089283542.

The spelling of 27628221 in words is "twenty-seven million, six hundred twenty-eight thousand, two hundred twenty-one".