320885565 has 192 divisors, whose sum is σ = 728082432. Its totient is φ = 118540800.

The previous prime is 320885533. The next prime is 320885569. The reversal of 320885565 is 565588023.

It is not a de Polignac number, because 320885565 - 2⁵ = 320885533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320885569) 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 191 ways as a sum of consecutive naturals, for example, 4519480 + ... + 4519550.

It is an arithmetic number, because the mean of its divisors is an integer number (3792096).

Almost surely, 2^320885565 is an apocalyptic number.

320885565 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

320885565 is an abundant number, since it is smaller than the sum of its proper divisors (407196867).

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

320885565 is a wasteful number, since it uses less digits than its factorization.

320885565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160 (or 153 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 42.

The square root of 320885565 is about 17913.2790130674. The cubic root of 320885565 is about 684.6207537170.

The spelling of 320885565 in words is "three hundred twenty million, eight hundred eighty-five thousand, five hundred sixty-five".