71609856 has 80 divisors (see below), whose sum is σ = 199165824. Its totient is φ = 22820864.

The previous prime is 71609809. The next prime is 71609869. The reversal of 71609856 is 65890617.

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, 34315 + ... + 36341.

Almost surely, 2^71609856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71609856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99582912).

71609856 is an abundant number, since it is smaller than the sum of its proper divisors (127555968).

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

71609856 is a wasteful number, since it uses less digits than its factorization.

71609856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2071 (or 2055 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 71609856 is about 8462.2606908556. The cubic root of 71609856 is about 415.2639845555.

The spelling of 71609856 in words is "seventy-one million, six hundred nine thousand, eight hundred fifty-six".