71690065 has 8 divisors (see below), whose sum is σ = 86073768. Its totient is φ = 57321600.

The previous prime is 71690041. The next prime is 71690083. The reversal of 71690065 is 56009617.

It can be written as a sum of positive squares in 4 ways, for example, as 7177041 + 64513024 = 2679^2 + 8032^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-71690065 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71690065.

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 7 ways as a sum of consecutive naturals, for example, 14965 + ... + 19165.

It is an arithmetic number, because the mean of its divisors is an integer number (10759221).

Almost surely, 2^71690065 is an apocalyptic number.

It is an amenable number.

71690065 is a deficient number, since it is larger than the sum of its proper divisors (14383703).

71690065 is a wasteful number, since it uses less digits than its factorization.

71690065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7619.

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 71690065 is about 8466.9985827328. The cubic root of 71690065 is about 415.4189701150.

The spelling of 71690065 in words is "seventy-one million, six hundred ninety thousand, sixty-five".