81168744 has 32 divisors (see below), whose sum is σ = 214859520. Its totient is φ = 25464576.

The previous prime is 81168743. The next prime is 81168749. The reversal of 81168744 is 44786118.

It is not an unprimeable number, because it can be changed into a prime (81168743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99064 + ... + 99879.

It is an arithmetic number, because the mean of its divisors is an integer number (6714360).

Almost surely, 2^81168744 is an apocalyptic number.

It is an amenable number.

81168744 is an abundant number, since it is smaller than the sum of its proper divisors (133690776).

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

81168744 is a wasteful number, since it uses less digits than its factorization.

81168744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198969 (or 198965 counting only the distinct ones).

The product of its digits is 43008, while the sum is 39.

The square root of 81168744 is about 9009.3697892805. The cubic root of 81168744 is about 432.9751206666.

The spelling of 81168744 in words is "eighty-one million, one hundred sixty-eight thousand, seven hundred forty-four".