27191580220 has 96 divisors (see below), whose sum is σ = 66724116480. Its totient is φ = 9114094080.

The previous prime is 27191580209. The next prime is 27191580259. The reversal of 27191580220 is 2208519172.

It is a self number, because there is not a number n which added to its sum of digits gives 27191580220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7703416 + ... + 7706944.

It is an arithmetic number, because the mean of its divisors is an integer number (695042880).

Almost surely, 2^27191580220 is an apocalyptic number.

27191580220 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 27191580220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33362058240).

27191580220 is an abundant number, since it is smaller than the sum of its proper divisors (39532536260).

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

27191580220 is a wasteful number, since it uses less digits than its factorization.

27191580220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4763 (or 4761 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 37.

The spelling of 27191580220 in words is "twenty-seven billion, one hundred ninety-one million, five hundred eighty thousand, two hundred twenty".