671804817 has 8 divisors (see below), whose sum is σ = 897333024. Its totient is φ = 447073248.

The previous prime is 671804801. The next prime is 671804821. The reversal of 671804817 is 718408176.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 671804817 - 2⁴ = 671804801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (671804897) by changing a digit.

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, 197188 + ... + 200565.

It is an arithmetic number, because the mean of its divisors is an integer number (112166628).

Almost surely, 2^671804817 is an apocalyptic number.

It is an amenable number.

671804817 is a deficient number, since it is larger than the sum of its proper divisors (225528207).

671804817 is a wasteful number, since it uses less digits than its factorization.

671804817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398319.

The product of its (nonzero) digits is 75264, while the sum is 42.

The square root of 671804817 is about 25919.1978463841. The cubic root of 671804817 is about 875.8190174163.

The spelling of 671804817 in words is "six hundred seventy-one million, eight hundred four thousand, eight hundred seventeen".