320688237828 has 96 divisors (see below), whose sum is σ = 880116120576. Its totient is φ = 88976909952.

The previous prime is 320688237823. The next prime is 320688237829. The reversal of 320688237828 is 828732886023.

It is not an unprimeable number, because it can be changed into a prime (320688237823) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 368275 + ... + 881477.

It is an arithmetic number, because the mean of its divisors is an integer number (9167876256).

Almost surely, 2^320688237828 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 320688237828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (440058060288).

320688237828 is an abundant number, since it is smaller than the sum of its proper divisors (559427882748).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

320688237828 is a wasteful number, since it uses less digits than its factorization.

320688237828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513433 (or 513431 counting only the distinct ones).

The product of its (nonzero) digits is 12386304, while the sum is 57.

The spelling of 320688237828 in words is "three hundred twenty billion, six hundred eighty-eight million, two hundred thirty-seven thousand, eight hundred twenty-eight".