71660816 has 10 divisors (see below), whose sum is σ = 138842862. Its totient is φ = 35830400.

The previous prime is 71660791. The next prime is 71660819. The reversal of 71660816 is 61806617.

It can be written as a sum of positive squares in only one way, i.e., 60902416 + 10758400 = 7804^2 + 3280^2 .

It is not an unprimeable number, because it can be changed into a prime (71660819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2239385 + ... + 2239416.

Almost surely, 2^71660816 is an apocalyptic number.

It is an amenable number.

71660816 is a deficient number, since it is larger than the sum of its proper divisors (67182046).

71660816 is a wasteful number, since it uses less digits than its factorization.

71660816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4478809 (or 4478803 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 71660816 is about 8465.2711710848. The cubic root of 71660816 is about 415.3624665057.

The spelling of 71660816 in words is "seventy-one million, six hundred sixty thousand, eight hundred sixteen".