71991960 has 32 divisors (see below), whose sum is σ = 215976240. Its totient is φ = 19197824.

The previous prime is 71991947. The next prime is 71992003. The reversal of 71991960 is 6919917.

It is a congruent number.

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, 299847 + ... + 300086.

Almost surely, 2^71991960 is an apocalyptic number.

It is an amenable number.

71991960 is an abundant number, since it is smaller than the sum of its proper divisors (143984280).

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

71991960 is a wasteful number, since it uses less digits than its factorization.

71991960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599947 (or 599943 counting only the distinct ones).

The product of its (nonzero) digits is 30618, while the sum is 42.

The square root of 71991960 is about 8484.8075994686. The cubic root of 71991960 is about 416.0012789655.

The spelling of 71991960 in words is "seventy-one million, nine hundred ninety-one thousand, nine hundred sixty".