320785920 has 800 divisors, whose sum is σ = 1497279168. Its totient is φ = 63700992.

The previous prime is 320785909. The next prime is 320785921. The reversal of 320785920 is 29587023.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320785921) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 18869752 + ... + 18869768.

Almost surely, 2^320785920 is an apocalyptic number.

320785920 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 320785920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (748639584).

320785920 is an abundant number, since it is smaller than the sum of its proper divisors (1176493248).

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

320785920 is a wasteful number, since it uses less digits than its factorization.

320785920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 320785920 is about 17910.4974805280. The cubic root of 320785920 is about 684.5498809978.

The spelling of 320785920 in words is "three hundred twenty million, seven hundred eighty-five thousand, nine hundred twenty".