320613720 has 128 divisors (see below), whose sum is σ = 1104537600. Its totient is φ = 72930816.

The previous prime is 320613707. The next prime is 320613731. The reversal of 320613720 is 27316023.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 199962 + ... + 201558.

It is an arithmetic number, because the mean of its divisors is an integer number (8629200).

Almost surely, 2^320613720 is an apocalyptic number.

320613720 is a gapful number since it is divisible by the number (30) 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 320613720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (552268800).

320613720 is an abundant number, since it is smaller than the sum of its proper divisors (783923880).

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

320613720 is a wasteful number, since it uses less digits than its factorization.

320613720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1857 (or 1853 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 24.

The square root of 320613720 is about 17905.6895985606. The cubic root of 320613720 is about 684.4273687747.

Adding to 320613720 its reverse (27316023), we get a palindrome (347929743).

The spelling of 320613720 in words is "three hundred twenty million, six hundred thirteen thousand, seven hundred twenty".