320111332440 has 128 divisors (see below), whose sum is σ = 965872512000. Its totient is φ = 84871851008.

The previous prime is 320111332439. The next prime is 320111332441. The reversal of 320111332440 is 44233111023.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (320111332439) and next prime (320111332441).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 320111332440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320111332441) 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, 18891652 + ... + 18908588.

It is an arithmetic number, because the mean of its divisors is an integer number (7545879000).

Almost surely, 2^320111332440 is an apocalyptic number.

320111332440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 320111332440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (482936256000).

320111332440 is an abundant number, since it is smaller than the sum of its proper divisors (645761179560).

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

320111332440 is a wasteful number, since it uses less digits than its factorization.

320111332440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17849 (or 17845 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 320111332440 its reverse (44233111023), we get a palindrome (364344443463).

The spelling of 320111332440 in words is "three hundred twenty billion, one hundred eleven million, three hundred thirty-two thousand, four hundred forty".