81086064 has 60 divisors (see below), whose sum is σ = 213051096. Its totient is φ = 26574336.

The previous prime is 81086051. The next prime is 81086077. The reversal of 81086064 is 46068018.

It is an interprime number because it is at equal distance from previous prime (81086051) and next prime (81086077).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 255634 + ... + 255950.

Almost surely, 2^81086064 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 81086064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106525548).

81086064 is an abundant number, since it is smaller than the sum of its proper divisors (131965032).

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

81086064 is a wasteful number, since it uses less digits than its factorization.

81086064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474 (or 395 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 81086064 is about 9004.7800639438. The cubic root of 81086064 is about 432.8280585379.

The spelling of 81086064 in words is "eighty-one million, eighty-six thousand, sixty-four".