320555872 has 192 divisors, whose sum is σ = 829108224. Its totient is φ = 118609920.

The previous prime is 320555867. The next prime is 320555923. The reversal of 320555872 is 278555023.

It is a congruent number.

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, 4784383 + ... + 4784449.

It is an arithmetic number, because the mean of its divisors is an integer number (4318272).

Almost surely, 2^320555872 is an apocalyptic number.

320555872 is a gapful number since it is divisible by the number (32) 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 320555872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (414554112).

320555872 is an abundant number, since it is smaller than the sum of its proper divisors (508552352).

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

320555872 is a wasteful number, since it uses less digits than its factorization.

320555872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181 (or 173 counting only the distinct ones).

The product of its (nonzero) digits is 84000, while the sum is 37.

The square root of 320555872 is about 17904.0741732154. The cubic root of 320555872 is about 684.3862027926.

The spelling of 320555872 in words is "three hundred twenty million, five hundred fifty-five thousand, eight hundred seventy-two".