71224144 has 20 divisors (see below), whose sum is σ = 138207796. Its totient is φ = 35557632.

The previous prime is 71224099. The next prime is 71224159. The reversal of 71224144 is 44142217.

It can be written as a sum of positive squares in 2 ways, for example, as 67568400 + 3655744 = 8220^2 + 1912^2 .

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 3 ways as a sum of consecutive naturals, for example, 8692 + ... + 14764.

Almost surely, 2^71224144 is an apocalyptic number.

It is an amenable number.

71224144 is a deficient number, since it is larger than the sum of its proper divisors (66983652).

71224144 is a wasteful number, since it uses less digits than its factorization.

71224144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6814 (or 6808 counting only the distinct ones).

The product of its digits is 1792, while the sum is 25.

The square root of 71224144 is about 8439.4397918345. The cubic root of 71224144 is about 414.5170634230.

The spelling of 71224144 in words is "seventy-one million, two hundred twenty-four thousand, one hundred forty-four".