320040403440 has 160 divisors (see below), whose sum is σ = 1068630055680. Its totient is φ = 78971977728.

The previous prime is 320040403409. The next prime is 320040403447. The reversal of 320040403440 is 44304040023.

It is a happy number.

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 320040403440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320040403447) 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, 620017 + ... + 1012176.

It is an arithmetic number, because the mean of its divisors is an integer number (6678937848).

Almost surely, 2^320040403440 is an apocalyptic number.

320040403440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

320040403440 is an abundant number, since it is smaller than the sum of its proper divisors (748589652240).

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

320040403440 is a wasteful number, since it uses less digits than its factorization.

320040403440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1632271 (or 1632265 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 24.

Adding to 320040403440 its reverse (44304040023), we get a palindrome (364344443463).

The spelling of 320040403440 in words is "three hundred twenty billion, forty million, four hundred three thousand, four hundred forty".