81067968 has 126 divisors (see below), whose sum is σ = 247346216. Its totient is φ = 25380864.

The previous prime is 81067967. The next prime is 81067993. The reversal of 81067968 is 86976018.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81067967) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 166221 + ... + 166707.

Almost surely, 2^81067968 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 81067968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123673108).

81067968 is an abundant number, since it is smaller than the sum of its proper divisors (166278248).

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

81067968 is a wasteful number, since it uses less digits than its factorization.

81067968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539 (or 509 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 81067968 is about 9003.7752082113. The cubic root of 81067968 is about 432.7958580220.

The spelling of 81067968 in words is "eighty-one million, sixty-seven thousand, nine hundred sixty-eight".