71239144 has 16 divisors (see below), whose sum is σ = 133981920. Its totient is φ = 35510640.

The previous prime is 71239127. The next prime is 71239153. The reversal of 71239144 is 44193217.

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, 10804 + ... + 16099.

It is an arithmetic number, because the mean of its divisors is an integer number (8373870).

Almost surely, 2^71239144 is an apocalyptic number.

It is an amenable number.

71239144 is a deficient number, since it is larger than the sum of its proper divisors (62742776).

71239144 is a wasteful number, since it uses less digits than its factorization.

71239144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27240 (or 27236 counting only the distinct ones).

The product of its digits is 6048, while the sum is 31.

The square root of 71239144 is about 8440.3284296288. The cubic root of 71239144 is about 414.5461608571.

The spelling of 71239144 in words is "seventy-one million, two hundred thirty-nine thousand, one hundred forty-four".