81011308 has 72 divisors (see below), whose sum is σ = 173644800. Its totient is φ = 32931360.

The previous prime is 81011303. The next prime is 81011309. The reversal of 81011308 is 80311018.

It is not an unprimeable number, because it can be changed into a prime (81011303) 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 23 ways as a sum of consecutive naturals, for example, 406993 + ... + 407191.

Almost surely, 2^81011308 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 81011308, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86822400).

81011308 is an abundant number, since it is smaller than the sum of its proper divisors (92633492).

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

81011308 is a wasteful number, since it uses less digits than its factorization.

81011308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 22.

The square root of 81011308 is about 9000.6282002980. The cubic root of 81011308 is about 432.6950046716.

It can be divided in two parts, 8101 and 1308, that added together give a square (9409 = 97²).

The spelling of 81011308 in words is "eighty-one million, eleven thousand, three hundred eight".