71808540 has 24 divisors (see below), whose sum is σ = 201064080. Its totient is φ = 19148928.

The previous prime is 71808533. The next prime is 71808559. The reversal of 71808540 is 4580817.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 598345 + ... + 598464.

It is an arithmetic number, because the mean of its divisors is an integer number (8377670).

Almost surely, 2^71808540 is an apocalyptic number.

It is an amenable number.

71808540 is an abundant number, since it is smaller than the sum of its proper divisors (129255540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71808540 is a wasteful number, since it uses less digits than its factorization.

71808540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1196821 (or 1196819 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 71808540 is about 8473.9919754505. The cubic root of 71808540 is about 415.6476846307.

The spelling of 71808540 in words is "seventy-one million, eight hundred eight thousand, five hundred forty".