671742668 has 6 divisors (see below), whose sum is σ = 1175549676. Its totient is φ = 335871332.

The previous prime is 671742661. The next prime is 671742679. The reversal of 671742668 is 866247176.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (671742661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83967830 + ... + 83967837.

It is an arithmetic number, because the mean of its divisors is an integer number (195924946).

Almost surely, 2^671742668 is an apocalyptic number.

It is an amenable number.

671742668 is a deficient number, since it is larger than the sum of its proper divisors (503807008).

671742668 is a wasteful number, since it uses less digits than its factorization.

671742668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167935671 (or 167935669 counting only the distinct ones).

The product of its digits is 677376, while the sum is 47.

The square root of 671742668 is about 25917.9989196697. The cubic root of 671742668 is about 875.7920090982.

The spelling of 671742668 in words is "six hundred seventy-one million, seven hundred forty-two thousand, six hundred sixty-eight".