71207144 has 8 divisors (see below), whose sum is σ = 133513410. Its totient is φ = 35603568.

The previous prime is 71207137. The next prime is 71207153. The reversal of 71207144 is 44170217.

It can be written as a sum of positive squares in only one way, i.e., 44063044 + 27144100 = 6638^2 + 5210^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4450439 + ... + 4450454.

Almost surely, 2^71207144 is an apocalyptic number.

It is an amenable number.

71207144 is a deficient number, since it is larger than the sum of its proper divisors (62306266).

71207144 is a wasteful number, since it uses less digits than its factorization.

71207144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8900899 (or 8900895 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 71207144 is about 8438.4325558720. The cubic root of 71207144 is about 414.4840813919.

The spelling of 71207144 in words is "seventy-one million, two hundred seven thousand, one hundred forty-four".