81086208 has 72 divisors (see below), whose sum is σ = 246653568. Its totient is φ = 23165952.

The previous prime is 81086207. The next prime is 81086219. The reversal of 81086208 is 80268018.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81086207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2166 + ... + 12917.

It is an arithmetic number, because the mean of its divisors is an integer number (3425744).

Almost surely, 2^81086208 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 81086208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123326784).

81086208 is an abundant number, since it is smaller than the sum of its proper divisors (165567360).

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

81086208 is a wasteful number, since it uses less digits than its factorization.

81086208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15109 (or 15095 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 81086208 is about 9004.7880596936. The cubic root of 81086208 is about 432.8283147562.

The spelling of 81086208 in words is "eighty-one million, eighty-six thousand, two hundred eight".