320778378 has 48 divisors (see below), whose sum is σ = 731068416. Its totient is φ = 101455200.

The previous prime is 320778371. The next prime is 320778397. The reversal of 320778378 is 873877023.

320778378 is a `hidden beast` number, since 3 + 207 + 78 + 378 = 666.

It is not an unprimeable number, because it can be changed into a prime (320778371) 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 23 ways as a sum of consecutive naturals, for example, 49528 + ... + 55628.

It is an arithmetic number, because the mean of its divisors is an integer number (15230592).

Almost surely, 2^320778378 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 320778378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (365534208).

320778378 is an abundant number, since it is smaller than the sum of its proper divisors (410290038).

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

320778378 is a wasteful number, since it uses less digits than its factorization.

320778378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6259 (or 6256 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 45.

The square root of 320778378 is about 17910.2869323749. The cubic root of 320778378 is about 684.5445161367.

The spelling of 320778378 in words is "three hundred twenty million, seven hundred seventy-eight thousand, three hundred seventy-eight".