71661964 has 24 divisors (see below), whose sum is σ = 137088000. Its totient is φ = 32507280.

The previous prime is 71661943. The next prime is 71661979. The reversal of 71661964 is 46916617.

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, 24997 + ... + 27715.

It is an arithmetic number, because the mean of its divisors is an integer number (5712000).

Almost surely, 2^71661964 is an apocalyptic number.

It is an amenable number.

71661964 is a deficient number, since it is larger than the sum of its proper divisors (65426036).

71661964 is a wasteful number, since it uses less digits than its factorization.

71661964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3333 (or 3331 counting only the distinct ones).

The product of its digits is 54432, while the sum is 40.

The square root of 71661964 is about 8465.3389772649. The cubic root of 71661964 is about 415.3646845173.

The spelling of 71661964 in words is "seventy-one million, six hundred sixty-one thousand, nine hundred sixty-four".