320463640 has 64 divisors (see below), whose sum is σ = 827184960. Its totient is φ = 109455360.

The previous prime is 320463631. The next prime is 320463641. The reversal of 320463640 is 46364023.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 320463599 and 320463608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320463641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76644 + ... + 80716.

It is an arithmetic number, because the mean of its divisors is an integer number (12924765).

Almost surely, 2^320463640 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 320463640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (413592480).

320463640 is an abundant number, since it is smaller than the sum of its proper divisors (506721320).

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

320463640 is a wasteful number, since it uses less digits than its factorization.

320463640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4372 (or 4368 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 28.

The square root of 320463640 is about 17901.4982613188. The cubic root of 320463640 is about 684.3205581124.

The spelling of 320463640 in words is "three hundred twenty million, four hundred sixty-three thousand, six hundred forty".