71561712 has 20 divisors (see below), whose sum is σ = 184867880. Its totient is φ = 23853888.

The previous prime is 71561641. The next prime is 71561741. The reversal of 71561712 is 21716517.

It is a self number, because there is not a number n which added to its sum of digits gives 71561712.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 745387 + ... + 745482.

It is an arithmetic number, because the mean of its divisors is an integer number (9243394).

Almost surely, 2^71561712 is an apocalyptic number.

It is an amenable number.

71561712 is an abundant number, since it is smaller than the sum of its proper divisors (113306168).

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

71561712 is a wasteful number, since it uses less digits than its factorization.

71561712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1490880 (or 1490874 counting only the distinct ones).

The product of its digits is 2940, while the sum is 30.

The square root of 71561712 is about 8459.4155826511. The cubic root of 71561712 is about 415.1709016922.

The spelling of 71561712 in words is "seventy-one million, five hundred sixty-one thousand, seven hundred twelve".