71851816 has 16 divisors (see below), whose sum is σ = 140580000. Its totient is φ = 34363824.

The previous prime is 71851811. The next prime is 71851837. The reversal of 71851816 is 61815817.

It is not an unprimeable number, because it can be changed into a prime (71851811) 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, 195066 + ... + 195433.

It is an arithmetic number, because the mean of its divisors is an integer number (8786250).

Almost surely, 2^71851816 is an apocalyptic number.

It is an amenable number.

71851816 is a deficient number, since it is larger than the sum of its proper divisors (68728184).

71851816 is a wasteful number, since it uses less digits than its factorization.

71851816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390528 (or 390524 counting only the distinct ones).

The product of its digits is 13440, while the sum is 37.

The square root of 71851816 is about 8476.5450509037. The cubic root of 71851816 is about 415.7311656807.

The spelling of 71851816 in words is "seventy-one million, eight hundred fifty-one thousand, eight hundred sixteen".