320441403136 has 72 divisors (see below), whose sum is σ = 663101921664. Its totient is φ = 154385940480.

The previous prime is 320441403109. The next prime is 320441403173. The reversal of 320441403136 is 631304144023.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a junction number, because it is equal to n+sod(n) for n = 320441403098 and 320441403107.

It is a congruent number.

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, 1762440 + ... + 1935736.

It is an arithmetic number, because the mean of its divisors is an integer number (9209748912).

Almost surely, 2^320441403136 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 320441403136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (331550960832).

320441403136 is an abundant number, since it is smaller than the sum of its proper divisors (342660518528).

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

320441403136 is a wasteful number, since it uses less digits than its factorization.

320441403136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173577 (or 173563 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 31.

Adding to 320441403136 its reverse (631304144023), we get a palindrome (951745547159).

The spelling of 320441403136 in words is "three hundred twenty billion, four hundred forty-one million, four hundred three thousand, one hundred thirty-six".