81085068 has 36 divisors (see below), whose sum is σ = 205503480. Its totient is φ = 26957376.

The previous prime is 81085063. The next prime is 81085091. The reversal of 81085068 is 86058018.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is not an unprimeable number, because it can be changed into a prime (81085061) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 11971 + ... + 17477.

It is an arithmetic number, because the mean of its divisors is an integer number (5708430).

Almost surely, 2^81085068 is an apocalyptic number.

It is an amenable number.

81085068 is an abundant number, since it is smaller than the sum of its proper divisors (124418412).

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

81085068 is a wasteful number, since it uses less digits than its factorization.

81085068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5926 (or 5921 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The square root of 81085068 is about 9004.7247598136. The cubic root of 81085068 is about 432.8262863529.

The spelling of 81085068 in words is "eighty-one million, eighty-five thousand, sixty-eight".