81167056 has 20 divisors (see below), whose sum is σ = 162684900. Its totient is φ = 39183872.

The previous prime is 81167039. The next prime is 81167057. The reversal of 81167056 is 65076118.

It can be written as a sum of positive squares in 2 ways, for example, as 62157456 + 19009600 = 7884^2 + 4360^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81167057) 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 3 ways as a sum of consecutive naturals, for example, 87001 + ... + 87928.

It is an arithmetic number, because the mean of its divisors is an integer number (8134245).

Almost surely, 2^81167056 is an apocalyptic number.

It is an amenable number.

81167056 is an abundant number, since it is smaller than the sum of its proper divisors (81517844).

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

81167056 is a wasteful number, since it uses less digits than its factorization.

81167056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174966 (or 174960 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 81167056 is about 9009.2761085450. The cubic root of 81167056 is about 432.9721192359.

The spelling of 81167056 in words is "eighty-one million, one hundred sixty-seven thousand, fifty-six".