71215144 has 64 divisors (see below), whose sum is σ = 179303040. Its totient is φ = 25608960.

The previous prime is 71215139. The next prime is 71215163. The reversal of 71215144 is 44151217.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3562 + ... + 12454.

It is an arithmetic number, because the mean of its divisors is an integer number (2801610).

Almost surely, 2^71215144 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 71215144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89651520).

71215144 is an abundant number, since it is smaller than the sum of its proper divisors (108087896).

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

71215144 is a wasteful number, since it uses less digits than its factorization.

71215144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8930 (or 8926 counting only the distinct ones).

The product of its digits is 1120, while the sum is 25.

The square root of 71215144 is about 8438.9065642416. The cubic root of 71215144 is about 414.4996030016.

The spelling of 71215144 in words is "seventy-one million, two hundred fifteen thousand, one hundred forty-four".