71147144 has 8 divisors (see below), whose sum is σ = 133400910. Its totient is φ = 35573568.

The previous prime is 71147137. The next prime is 71147149. The reversal of 71147144 is 44174117.

It can be written as a sum of positive squares in only one way, i.e., 57912100 + 13235044 = 7610^2 + 3638^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (71147149) 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 as a sum of consecutive naturals, namely, 4446689 + ... + 4446704.

Almost surely, 2^71147144 is an apocalyptic number.

It is an amenable number.

71147144 is a deficient number, since it is larger than the sum of its proper divisors (62253766).

71147144 is a wasteful number, since it uses less digits than its factorization.

71147144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8893399 (or 8893395 counting only the distinct ones).

The product of its digits is 3136, while the sum is 29.

The square root of 71147144 is about 8434.8766440298. The cubic root of 71147144 is about 414.3676322468.

The spelling of 71147144 in words is "seventy-one million, one hundred forty-seven thousand, one hundred forty-four".