671730643 has 4 divisors (see below), whose sum is σ = 672028960. Its totient is φ = 671432328.

The previous prime is 671730641. The next prime is 671730659. The reversal of 671730643 is 346037176.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 671730643 - 2¹ = 671730641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671730641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145755 + ... + 150292.

It is an arithmetic number, because the mean of its divisors is an integer number (168007240).

Almost surely, 2^671730643 is an apocalyptic number.

671730643 is a deficient number, since it is larger than the sum of its proper divisors (298317).

671730643 is a wasteful number, since it uses less digits than its factorization.

671730643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298316.

The product of its (nonzero) digits is 63504, while the sum is 37.

The square root of 671730643 is about 25917.7669369875. The cubic root of 671730643 is about 875.7867831576.

The spelling of 671730643 in words is "six hundred seventy-one million, seven hundred thirty thousand, six hundred forty-three".