27187881728 has 72 divisors (see below), whose sum is σ = 62872279008. Its totient is φ = 11492278272.

The previous prime is 27187881701. The next prime is 27187881731. The reversal of 27187881728 is 82718878172.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26900 + ... + 234732.

Almost surely, 2^27187881728 is an apocalyptic number.

27187881728 is a gapful number since it is divisible by the number (28) 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 27187881728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31436139504).

27187881728 is an abundant number, since it is smaller than the sum of its proper divisors (35684397280).

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

27187881728 is an equidigital number, since it uses as much as digits as its factorization.

27187881728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207929 (or 207915 counting only the distinct ones).

The product of its digits is 5619712, while the sum is 59.

The spelling of 27187881728 in words is "twenty-seven billion, one hundred eighty-seven million, eight hundred eighty-one thousand, seven hundred twenty-eight".