320768691688 has 32 divisors (see below), whose sum is σ = 642186072000. Its totient is φ = 149843409408.

The previous prime is 320768691641. The next prime is 320768691697. The reversal of 320768691688 is 886196867023.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20263113 + ... + 20278936.

It is an arithmetic number, because the mean of its divisors is an integer number (20068314750).

Almost surely, 2^320768691688 is an apocalyptic number.

It is an amenable number.

320768691688 is an abundant number, since it is smaller than the sum of its proper divisors (321417380312).

320768691688 is a wasteful number, since it uses less digits than its factorization.

320768691688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40542121 (or 40542117 counting only the distinct ones).

The product of its (nonzero) digits is 41803776, while the sum is 64.

The spelling of 320768691688 in words is "three hundred twenty billion, seven hundred sixty-eight million, six hundred ninety-one thousand, six hundred eighty-eight".