71665568 has 48 divisors (see below), whose sum is σ = 159959520. Its totient is φ = 31332096.

The previous prime is 71665543. The next prime is 71665577. The reversal of 71665568 is 86556617.

It is a zygodrome in base 3.

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, 3371 + ... + 12437.

It is an arithmetic number, because the mean of its divisors is an integer number (3332490).

Almost surely, 2^71665568 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 71665568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79979760).

71665568 is an abundant number, since it is smaller than the sum of its proper divisors (88293952).

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

71665568 is a wasteful number, since it uses less digits than its factorization.

71665568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9109 (or 9101 counting only the distinct ones).

The product of its digits is 302400, while the sum is 44.

The square root of 71665568 is about 8465.5518426149. The cubic root of 71665568 is about 415.3716475288.

The spelling of 71665568 in words is "seventy-one million, six hundred sixty-five thousand, five hundred sixty-eight".