71491213992 has 32 divisors (see below), whose sum is σ = 194976038880. Its totient is φ = 21664004160.

The previous prime is 71491213979. The next prime is 71491214017. The reversal of 71491213992 is 29931219417.

It is a super-2 number, since 2×71491213992² (a number of 23 digits) contains 22 as substring.

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, 135399763 + ... + 135400290.

It is an arithmetic number, because the mean of its divisors is an integer number (6093001215).

Almost surely, 2^71491213992 is an apocalyptic number.

It is an amenable number.

71491213992 is an abundant number, since it is smaller than the sum of its proper divisors (123484824888).

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

71491213992 is a wasteful number, since it uses less digits than its factorization.

71491213992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270800073 (or 270800069 counting only the distinct ones).

The product of its digits is 244944, while the sum is 48.

The spelling of 71491213992 in words is "seventy-one billion, four hundred ninety-one million, two hundred thirteen thousand, nine hundred ninety-two".