71087720 has 32 divisors (see below), whose sum is σ = 174489120. Its totient is φ = 25849920.

The previous prime is 71087719. The next prime is 71087741. The reversal of 71087720 is 2778017.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80342 + ... + 81221.

It is an arithmetic number, because the mean of its divisors is an integer number (5452785).

Almost surely, 2^71087720 is an apocalyptic number.

It is an amenable number.

71087720 is an abundant number, since it is smaller than the sum of its proper divisors (103401400).

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

71087720 is a wasteful number, since it uses less digits than its factorization.

71087720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161585 (or 161581 counting only the distinct ones).

The product of its (nonzero) digits is 5488, while the sum is 32.

The square root of 71087720 is about 8431.3533907671. The cubic root of 71087720 is about 414.2522364658.

The spelling of 71087720 in words is "seventy-one million, eighty-seven thousand, seven hundred twenty".