71091808 has 24 divisors (see below), whose sum is σ = 140638680. Its totient is φ = 35374080.

The previous prime is 71091799. The next prime is 71091809. The reversal of 71091808 is 80819017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71091809) 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, 1488 + ... + 12016.

It is an arithmetic number, because the mean of its divisors is an integer number (5859945).

Almost surely, 2^71091808 is an apocalyptic number.

It is an amenable number.

71091808 is a deficient number, since it is larger than the sum of its proper divisors (69546872).

71091808 is a wasteful number, since it uses less digits than its factorization.

71091808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10750 (or 10742 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 34.

The square root of 71091808 is about 8431.5958157397. The cubic root of 71091808 is about 414.2601770341.

The spelling of 71091808 in words is "seventy-one million, ninety-one thousand, eight hundred eight".