71665038 has 12 divisors (see below), whose sum is σ = 155274288. Its totient is φ = 23888340.

The previous prime is 71665021. The next prime is 71665051. The reversal of 71665038 is 83056617.

It is a junction number, because it is equal to n+sod(n) for n = 71664993 and 71665011.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 1990678 + ... + 1990713.

It is an arithmetic number, because the mean of its divisors is an integer number (12939524).

Almost surely, 2^71665038 is an apocalyptic number.

71665038 is an abundant number, since it is smaller than the sum of its proper divisors (83609250).

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

71665038 is a wasteful number, since it uses less digits than its factorization.

71665038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3981399 (or 3981396 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 71665038 is about 8465.5205392226. The cubic root of 71665038 is about 415.3706235711.

The spelling of 71665038 in words is "seventy-one million, six hundred sixty-five thousand, thirty-eight".