81310086 has 96 divisors (see below), whose sum is σ = 213857280. Its totient is φ = 21988800.

The previous prime is 81310079. The next prime is 81310121. The reversal of 81310086 is 68001318.

It is a super-2 number, since 2×81310086² = 13222660170654792, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 79285 + ... + 80303.

It is an arithmetic number, because the mean of its divisors is an integer number (2227680).

Almost surely, 2^81310086 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81310086, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106928640).

81310086 is an abundant number, since it is smaller than the sum of its proper divisors (132547194).

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

81310086 is a wasteful number, since it uses less digits than its factorization.

81310086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082 (or 1079 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 81310086 is about 9017.2105442870. The cubic root of 81310086 is about 433.2262932197.

It can be divided in two parts, 813 and 10086, that multiplied together give a palindrome (8199918).

The spelling of 81310086 in words is "eighty-one million, three hundred ten thousand, eighty-six".