27988411380 has 192 divisors, whose sum is σ = 87747287040. Its totient is φ = 6631833600.

The previous prime is 27988411379. The next prime is 27988411403. The reversal of 27988411380 is 8311488972.

It is a super-2 number, since 2×27988411380² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

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 63 ways as a sum of consecutive naturals, for example, 1285626 + ... + 1307214.

It is an arithmetic number, because the mean of its divisors is an integer number (457017120).

Almost surely, 2^27988411380 is an apocalyptic number.

27988411380 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 27988411380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43873643520).

27988411380 is an abundant number, since it is smaller than the sum of its proper divisors (59758875660).

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

27988411380 is a wasteful number, since it uses less digits than its factorization.

27988411380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21690 (or 21688 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 51.

The spelling of 27988411380 in words is "twenty-seven billion, nine hundred eighty-eight million, four hundred eleven thousand, three hundred eighty".