320660947 has 4 divisors (see below), whose sum is σ = 320698336. Its totient is φ = 320623560.

The previous prime is 320660941. The next prime is 320661007. The reversal of 320660947 is 749066023.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 749066023 = 41 ⋅18269903.

It is a cyclic number.

It is not a de Polignac number, because 320660947 - 2⁷ = 320660819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320660941) 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, 1297 + ... + 25357.

It is an arithmetic number, because the mean of its divisors is an integer number (80174584).

Almost surely, 2^320660947 is an apocalyptic number.

320660947 is a deficient number, since it is larger than the sum of its proper divisors (37389).

320660947 is a wasteful number, since it uses less digits than its factorization.

320660947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37388.

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 320660947 is about 17907.0083207665. The cubic root of 320660947 is about 684.4609729348.

The spelling of 320660947 in words is "three hundred twenty million, six hundred sixty thousand, nine hundred forty-seven".