671679643 has 8 divisors (see below), whose sum is σ = 704361600. Its totient is φ = 639632448.

The previous prime is 671679641. The next prime is 671679661. The reversal of 671679643 is 346976176.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 671679643 - 2¹ = 671679641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671679641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156523 + ... + 160756.

It is an arithmetic number, because the mean of its divisors is an integer number (88045200).

Almost surely, 2^671679643 is an apocalyptic number.

671679643 is a deficient number, since it is larger than the sum of its proper divisors (32681957).

671679643 is a wasteful number, since it uses less digits than its factorization.

671679643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317381.

The product of its digits is 1143072, while the sum is 49.

The square root of 671679643 is about 25916.7830372521. The cubic root of 671679643 is about 875.7646183922.

The spelling of 671679643 in words is "six hundred seventy-one million, six hundred seventy-nine thousand, six hundred forty-three".