81106488 has 64 divisors (see below), whose sum is σ = 226060800. Its totient is φ = 26943840.

The previous prime is 81106469. The next prime is 81106499. The reversal of 81106488 is 88460118.

81106488 is a `hidden beast` number, since 8 + 1 + 1 + 0 + 648 + 8 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99603 + ... + 100413.

It is an arithmetic number, because the mean of its divisors is an integer number (3532200).

Almost surely, 2^81106488 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 81106488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113030400).

81106488 is an abundant number, since it is smaller than the sum of its proper divisors (144954312).

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

81106488 is a wasteful number, since it uses less digits than its factorization.

81106488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1289 (or 1279 counting only the distinct ones).

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

The square root of 81106488 is about 9005.9140568851. The cubic root of 81106488 is about 432.8643958060.

The spelling of 81106488 in words is "eighty-one million, one hundred six thousand, four hundred eighty-eight".