320403630456 has 160 divisors (see below), whose sum is σ = 1104525539040. Its totient is φ = 84502040832.

The previous prime is 320403630451. The next prime is 320403630493. The reversal of 320403630456 is 654036304023.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 320403630456.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320403630451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2657791 + ... + 2775726.

It is an arithmetic number, because the mean of its divisors is an integer number (6903284619).

Almost surely, 2^320403630456 is an apocalyptic number.

320403630456 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

320403630456 is an abundant number, since it is smaller than the sum of its proper divisors (784121908584).

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

320403630456 is a wasteful number, since it uses less digits than its factorization.

320403630456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5433555 (or 5433542 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 36.

Adding to 320403630456 its reverse (654036304023), we get a palindrome (974439934479).

The spelling of 320403630456 in words is "three hundred twenty billion, four hundred three million, six hundred thirty thousand, four hundred fifty-six".