81140886288 has 240 divisors, whose sum is σ = 283843487616. Its totient is φ = 21021327360.

The previous prime is 81140886223. The next prime is 81140886289. The reversal of 81140886288 is 88268804118.

81140886288 is a `hidden beast` number, since 8 + 1 + 1 + 4 + 0 + 8 + 8 + 628 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (81140886289) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4392720 + ... + 4411152.

Almost surely, 2^81140886288 is an apocalyptic number.

81140886288 is a gapful number since it is divisible by the number (88) 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 81140886288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141921743808).

81140886288 is an abundant number, since it is smaller than the sum of its proper divisors (202702601328).

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

81140886288 is a wasteful number, since it uses less digits than its factorization.

81140886288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18862 (or 18853 counting only the distinct ones).

The product of its (nonzero) digits is 1572864, while the sum is 54.

The spelling of 81140886288 in words is "eighty-one billion, one hundred forty million, eight hundred eighty-six thousand, two hundred eighty-eight".