671766891 has 32 divisors (see below), whose sum is σ = 934053120. Its totient is φ = 429197184.

The previous prime is 671766877. The next prime is 671766899. The reversal of 671766891 is 198667176.

It is not a de Polignac number, because 671766891 - 2⁵ = 671766859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (671766899) 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 31 ways as a sum of consecutive naturals, for example, 1438240 + ... + 1438706.

It is an arithmetic number, because the mean of its divisors is an integer number (29189160).

Almost surely, 2^671766891 is an apocalyptic number.

671766891 is a deficient number, since it is larger than the sum of its proper divisors (262286229).

671766891 is a wasteful number, since it uses less digits than its factorization.

671766891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715.

The product of its digits is 762048, while the sum is 51.

The square root of 671766891 is about 25918.4662161942. The cubic root of 671766891 is about 875.8025359739.

The spelling of 671766891 in words is "six hundred seventy-one million, seven hundred sixty-six thousand, eight hundred ninety-one".