81230976 has 96 divisors (see below), whose sum is σ = 236293200. Its totient is φ = 26783232.

The previous prime is 81230959. The next prime is 81230983. The reversal of 81230976 is 67903218.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 81230976.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 122935 + ... + 123593.

Almost surely, 2^81230976 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 81230976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118146600).

81230976 is an abundant number, since it is smaller than the sum of its proper divisors (155062224).

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

81230976 is a wasteful number, since it uses less digits than its factorization.

81230976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 786 (or 771 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 81230976 is about 9012.8228652293. The cubic root of 81230976 is about 433.0857462724.

The spelling of 81230976 in words is "eighty-one million, two hundred thirty thousand, nine hundred seventy-six".