671781267 has 12 divisors (see below), whose sum is σ = 971407320. Its totient is φ = 447366528.

The previous prime is 671781247. The next prime is 671781337. The reversal of 671781267 is 762187176.

It is not a de Polignac number, because 671781267 - 2¹⁰ = 671780243 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (671781247) 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 11 ways as a sum of consecutive naturals, for example, 31813 + ... + 48534.

It is an arithmetic number, because the mean of its divisors is an integer number (80950610).

Almost surely, 2^671781267 is an apocalyptic number.

671781267 is a deficient number, since it is larger than the sum of its proper divisors (299626053).

671781267 is a wasteful number, since it uses less digits than its factorization.

671781267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81282 (or 81279 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 671781267 is about 25918.7435459360. The cubic root of 671781267 is about 875.8087834027.

The spelling of 671781267 in words is "six hundred seventy-one million, seven hundred eighty-one thousand, two hundred sixty-seven".