320740864 has 40 divisors (see below), whose sum is σ = 658214568. Its totient is φ = 156026880.

The previous prime is 320740813. The next prime is 320740873. The reversal of 320740864 is 468047023.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10479 + ... + 27409.

Almost surely, 2^320740864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 320740864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (329107284).

320740864 is an abundant number, since it is smaller than the sum of its proper divisors (337473704).

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

320740864 is an equidigital number, since it uses as much as digits as its factorization.

320740864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16986 (or 16970 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 320740864 is about 17909.2396265168. The cubic root of 320740864 is about 684.5178300030.

Adding to 320740864 its reverse (468047023), we get a palindrome (788787887).

The spelling of 320740864 in words is "three hundred twenty million, seven hundred forty thousand, eight hundred sixty-four".