81268308 has 36 divisors (see below), whose sum is σ = 224104608. Its totient is φ = 24626640.

The previous prime is 81268277. The next prime is 81268309. The reversal of 81268308 is 80386218.

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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81268309) 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, 102216 + ... + 103007.

It is an arithmetic number, because the mean of its divisors is an integer number (6225128).

Almost surely, 2^81268308 is an apocalyptic number.

It is an amenable number.

81268308 is an abundant number, since it is smaller than the sum of its proper divisors (142836300).

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

81268308 is a wasteful number, since it uses less digits than its factorization.

81268308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205244 (or 205239 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 81268308 is about 9014.8936765777. The cubic root of 81268308 is about 433.1520817259.

The spelling of 81268308 in words is "eighty-one million, two hundred sixty-eight thousand, three hundred eight".