320005072 has 20 divisors (see below), whose sum is σ = 646967520. Its totient is φ = 153045728.

The previous prime is 320005069. The next prime is 320005109. The reversal of 320005072 is 270500023.

It is a happy number.

It is a super-2 number, since 2×320005072² = 204806492211450368, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 434422 + ... + 435157.

It is an arithmetic number, because the mean of its divisors is an integer number (32348376).

Almost surely, 2^320005072 is an apocalyptic number.

It is an amenable number.

320005072 is an abundant number, since it is smaller than the sum of its proper divisors (326962448).

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

320005072 is a wasteful number, since it uses less digits than its factorization.

320005072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869610 (or 869604 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 19.

The square root of 320005072 is about 17888.6855861463. The cubic root of 320005072 is about 683.9939924008.

Adding to 320005072 its reverse (270500023), we get a palindrome (590505095).

The spelling of 320005072 in words is "three hundred twenty million, five thousand, seventy-two".