27788565888 has 128 divisors (see below), whose sum is σ = 82181196000. Its totient is φ = 9244071936.

The previous prime is 27788565841. The next prime is 27788565899. The reversal of 27788565888 is 88856588772.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×27788565888² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1751206 + ... + 1767002.

Almost surely, 2^27788565888 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 27788565888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41090598000).

27788565888 is an abundant number, since it is smaller than the sum of its proper divisors (54392630112).

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

27788565888 is a wasteful number, since it uses less digits than its factorization.

27788565888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16329 (or 16311 counting only the distinct ones).

The product of its digits is 481689600, while the sum is 72.

The spelling of 27788565888 in words is "twenty-seven billion, seven hundred eighty-eight million, five hundred sixty-five thousand, eight hundred eighty-eight".