27856220 has 96 divisors (see below), whose sum is σ = 71801856. Its totient is φ = 8870400.

The previous prime is 27856207. The next prime is 27856229. The reversal of 27856220 is 2265872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27856229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 131915 + ... + 132125.

It is an arithmetic number, because the mean of its divisors is an integer number (747936).

Almost surely, 2^27856220 is an apocalyptic number.

27856220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27856220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35900928).

27856220 is an abundant number, since it is smaller than the sum of its proper divisors (43945636).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27856220 is a wasteful number, since it uses less digits than its factorization.

27856220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291 (or 289 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 27856220 is about 5277.8992032815. The cubic root of 27856220 is about 303.1382421678.

The spelling of 27856220 in words is "twenty-seven million, eight hundred fifty-six thousand, two hundred twenty".