71543660 has 48 divisors (see below), whose sum is σ = 156038400. Its totient is φ = 27525120.

The previous prime is 71543657. The next prime is 71543677. The reversal of 71543660 is 6634517.

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 15 ways as a sum of consecutive naturals, for example, 159116 + ... + 159564.

It is an arithmetic number, because the mean of its divisors is an integer number (3250800).

Almost surely, 2^71543660 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 71543660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78019200).

71543660 is an abundant number, since it is smaller than the sum of its proper divisors (84494740).

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

71543660 is a wasteful number, since it uses less digits than its factorization.

71543660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746 (or 744 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 71543660 is about 8458.3485385742. The cubic root of 71543660 is about 415.1359887236.

The spelling of 71543660 in words is "seventy-one million, five hundred forty-three thousand, six hundred sixty".