71217872 has 40 divisors (see below), whose sum is σ = 151463520. Its totient is φ = 32170880.

The previous prime is 71217857. The next prime is 71217907. The reversal of 71217872 is 27871217.

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 7 ways as a sum of consecutive naturals, for example, 29279 + ... + 31617.

It is an arithmetic number, because the mean of its divisors is an integer number (3786588).

Almost surely, 2^71217872 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 71217872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75731760).

71217872 is an abundant number, since it is smaller than the sum of its proper divisors (80245648).

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

71217872 is a wasteful number, since it uses less digits than its factorization.

71217872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2531 (or 2525 counting only the distinct ones).

The product of its digits is 10976, while the sum is 35.

The square root of 71217872 is about 8439.0681950083. The cubic root of 71217872 is about 414.5048956047.

The spelling of 71217872 in words is "seventy-one million, two hundred seventeen thousand, eight hundred seventy-two".