27128891216 has 80 divisors (see below), whose sum is σ = 61446138624. Its totient is φ = 11362271232.

The previous prime is 27128891191. The next prime is 27128891219. The reversal of 27128891216 is 61219882172.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27128891219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1516661 + ... + 1534443.

Almost surely, 2^27128891216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27128891216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30723069312).

27128891216 is an abundant number, since it is smaller than the sum of its proper divisors (34317247408).

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

27128891216 is a wasteful number, since it uses less digits than its factorization.

27128891216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18108 (or 18102 counting only the distinct ones).

The product of its digits is 193536, while the sum is 47.

The spelling of 27128891216 in words is "twenty-seven billion, one hundred twenty-eight million, eight hundred ninety-one thousand, two hundred sixteen".