81041688 has 384 divisors, whose sum is σ = 306432000. Its totient is φ = 19595520.

The previous prime is 81041671. The next prime is 81041711. The reversal of 81041688 is 88614018.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 14.

It is a congruent number.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 2614233 + ... + 2614263.

It is an arithmetic number, because the mean of its divisors is an integer number (798000).

Almost surely, 2^81041688 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 81041688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153216000).

81041688 is an abundant number, since it is smaller than the sum of its proper divisors (225390312).

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

81041688 is a wasteful number, since it uses less digits than its factorization.

81041688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92 (or 75 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 81041688 is about 9002.3157020847. The cubic root of 81041688 is about 432.7490861396.

The spelling of 81041688 in words is "eighty-one million, forty-one thousand, six hundred eighty-eight".