81075707 has 8 divisors (see below), whose sum is σ = 82163520. Its totient is φ = 79992000.

The previous prime is 81075697. The next prime is 81075733. The reversal of 81075707 is 70757018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81075707 - 2²² = 76881403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81075307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66233 + ... + 67445.

It is an arithmetic number, because the mean of its divisors is an integer number (10270440).

Almost surely, 2^81075707 is an apocalyptic number.

81075707 is a deficient number, since it is larger than the sum of its proper divisors (1087813).

81075707 is a wasteful number, since it uses less digits than its factorization.

81075707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2053.

The product of its (nonzero) digits is 13720, while the sum is 35.

The square root of 81075707 is about 9004.2049621274. The cubic root of 81075707 is about 432.8096295960.

The spelling of 81075707 in words is "eighty-one million, seventy-five thousand, seven hundred seven".