81065708 has 24 divisors (see below), whose sum is σ = 148350048. Its totient is φ = 38687616.

The previous prime is 81065683. The next prime is 81065711. The reversal of 81065708 is 80756018.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77960 + ... + 78992.

It is an arithmetic number, because the mean of its divisors is an integer number (6181252).

Almost surely, 2^81065708 is an apocalyptic number.

It is an amenable number.

81065708 is a deficient number, since it is larger than the sum of its proper divisors (67284340).

81065708 is a wasteful number, since it uses less digits than its factorization.

81065708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1913 (or 1911 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 81065708 is about 9003.6497044254. The cubic root of 81065708 is about 432.7918361798.

The spelling of 81065708 in words is "eighty-one million, sixty-five thousand, seven hundred eight".