71807144 has 16 divisors (see below), whose sum is σ = 135532320. Its totient is φ = 35665200.

The previous prime is 71807111. The next prime is 71807147. The reversal of 71807144 is 44170817.

It is a self number, because there is not a number n which added to its sum of digits gives 71807144.

It is not an unprimeable number, because it can be changed into a prime (71807147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28514 + ... + 30929.

It is an arithmetic number, because the mean of its divisors is an integer number (8470770).

Almost surely, 2^71807144 is an apocalyptic number.

It is an amenable number.

71807144 is a deficient number, since it is larger than the sum of its proper divisors (63725176).

71807144 is a wasteful number, since it uses less digits than its factorization.

71807144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59600 (or 59596 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 71807144 is about 8473.9096053711. The cubic root of 71807144 is about 415.6449911352.

The spelling of 71807144 in words is "seventy-one million, eight hundred seven thousand, one hundred forty-four".