71384144 has 20 divisors (see below), whose sum is σ = 148946196. Its totient is φ = 32946432.

The previous prime is 71384129. The next prime is 71384147. The reversal of 71384144 is 44148317.

It can be written as a sum of positive squares in 2 ways, for example, as 8340544 + 63043600 = 2888^2 + 7940^2 .

It is a super-2 number, since 2×71384144² = 10191392029225472, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71384144.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71384147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171389 + ... + 171804.

Almost surely, 2^71384144 is an apocalyptic number.

It is an amenable number.

71384144 is an abundant number, since it is smaller than the sum of its proper divisors (77562052).

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

71384144 is a wasteful number, since it uses less digits than its factorization.

71384144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343214 (or 343208 counting only the distinct ones).

The product of its digits is 10752, while the sum is 32.

The square root of 71384144 is about 8448.9137763384. The cubic root of 71384144 is about 414.8272257042.

The spelling of 71384144 in words is "seventy-one million, three hundred eighty-four thousand, one hundred forty-four".