71047144 has 64 divisors (see below), whose sum is σ = 156764160. Its totient is φ = 29561280.

The previous prime is 71047139. The next prime is 71047147. The reversal of 71047144 is 44174017.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (71047147) by changing a digit.

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, 425349 + ... + 425515.

It is an arithmetic number, because the mean of its divisors is an integer number (2449440).

Almost surely, 2^71047144 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 71047144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78382080).

71047144 is an abundant number, since it is smaller than the sum of its proper divisors (85717016).

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

71047144 is a wasteful number, since it uses less digits than its factorization.

71047144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358 (or 354 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 71047144 is about 8428.9467906732. The cubic root of 71047144 is about 414.1734047641.

The spelling of 71047144 in words is "seventy-one million, forty-seven thousand, one hundred forty-four".