671691808 has 48 divisors (see below), whose sum is σ = 1347917760. Its totient is φ = 329414400.

The previous prime is 671691803. The next prime is 671691809. The reversal of 671691808 is 808196176.

It is not an unprimeable number, because it can be changed into a prime (671691803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 519643 + ... + 520933.

It is an arithmetic number, because the mean of its divisors is an integer number (28081620).

Almost surely, 2^671691808 is an apocalyptic number.

It is an amenable number.

671691808 is an abundant number, since it is smaller than the sum of its proper divisors (676225952).

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

671691808 is a wasteful number, since it uses less digits than its factorization.

671691808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1601 (or 1593 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 671691808 is about 25917.0177296694. The cubic root of 671691808 is about 875.7699054426.

The spelling of 671691808 in words is "six hundred seventy-one million, six hundred ninety-one thousand, eight hundred eight".