671684085 has 12 divisors (see below), whose sum is σ = 1164252492. Its totient is φ = 358231488.

The previous prime is 671684081. The next prime is 671684137. The reversal of 671684085 is 580486176.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 282845124 + 388838961 = 16818^2 + 19719^2 .

It is not a de Polignac number, because 671684085 - 2² = 671684081 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 14926313 = 671684085 / (6 + 7 + 1 + 6 + 8 + 4 + 0 + 8 + 5).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 671684085.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671684081) 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 11 ways as a sum of consecutive naturals, for example, 7463112 + ... + 7463201.

It is an arithmetic number, because the mean of its divisors is an integer number (97021041).

Almost surely, 2^671684085 is an apocalyptic number.

It is an amenable number.

671684085 is a deficient number, since it is larger than the sum of its proper divisors (492568407).

671684085 is a wasteful number, since it uses less digits than its factorization.

671684085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14926324 (or 14926321 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 671684085 is about 25916.8687344748. The cubic root of 671684085 is about 875.7665489444.

It can be divided in two parts, 67168 and 4085, that added together give a triangular number (71253 = T₃₇₇).

The spelling of 671684085 in words is "six hundred seventy-one million, six hundred eighty-four thousand, eighty-five".