320325138 has 64 divisors (see below), whose sum is σ = 817240320. Its totient is φ = 91103616.

The previous prime is 320325121. The next prime is 320325143. The reversal of 320325138 is 831523023.

320325138 is a `hidden beast` number, since 320 + 325 + 13 + 8 = 666.

320325138 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 86256 + ... + 89892.

It is an arithmetic number, because the mean of its divisors is an integer number (12769380).

Almost surely, 2^320325138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 320325138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (408620160).

320325138 is an abundant number, since it is smaller than the sum of its proper divisors (496915182).

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

320325138 is a wasteful number, since it uses less digits than its factorization.

320325138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3888 (or 3882 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 320325138 is about 17897.6293960960. The cubic root of 320325138 is about 684.2219578223.

The spelling of 320325138 in words is "three hundred twenty million, three hundred twenty-five thousand, one hundred thirty-eight".