320671643 has 4 divisors (see below), whose sum is σ = 321218520. Its totient is φ = 320124768.

The previous prime is 320671613. The next prime is 320671649. The reversal of 320671643 is 346176023.

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 320671643 - 2⁸ = 320671387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320671649) 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, 272558 + ... + 273731.

It is an arithmetic number, because the mean of its divisors is an integer number (80304630).

Almost surely, 2^320671643 is an apocalyptic number.

320671643 is a deficient number, since it is larger than the sum of its proper divisors (546877).

320671643 is an equidigital number, since it uses as much as digits as its factorization.

320671643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546876.

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 320671643 is about 17907.3069722949. The cubic root of 320671643 is about 684.4685831674.

The spelling of 320671643 in words is "three hundred twenty million, six hundred seventy-one thousand, six hundred forty-three".