671684685 has 16 divisors (see below), whose sum is σ = 1228223616. Its totient is φ = 307055808.

The previous prime is 671684683. The next prime is 671684687. The reversal of 671684685 is 586486176.

It is an interprime number because it is at equal distance from previous prime (671684683) and next prime (671684687).

It is not a de Polignac number, because 671684685 - 2¹ = 671684683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671684681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3198394 + ... + 3198603.

It is an arithmetic number, because the mean of its divisors is an integer number (76763976).

Almost surely, 2^671684685 is an apocalyptic number.

It is an amenable number.

671684685 is a deficient number, since it is larger than the sum of its proper divisors (556538931).

671684685 is a wasteful number, since it uses less digits than its factorization.

671684685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6397012.

The product of its digits is 1935360, while the sum is 51.

The square root of 671684685 is about 25916.8803099447. The cubic root of 671684685 is about 875.7668097117.

The spelling of 671684685 in words is "six hundred seventy-one million, six hundred eighty-four thousand, six hundred eighty-five".