2320640 has 108 divisors (see below), whose sum is σ = 6640956. Its totient is φ = 774144.

The previous prime is 2320639. The next prime is 2320649. The reversal of 2320640 is 460232.

It can be written as a sum of positive squares in 2 ways, for example, as 1517824 + 802816 = 1232^2 + 896^2 .

It is not an unprimeable number, because it can be changed into a prime (2320649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62702 + ... + 62738.

2^2320640 is an apocalyptic number.

2320640 is a gapful number since it is divisible by the number (20) 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 2320640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3320478).

2320640 is an abundant number, since it is smaller than the sum of its proper divisors (4320316).

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

2320640 is an equidigital number, since it uses as much as digits as its factorization.

2320640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72 (or 51 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 2320640 is about 1523.3646969784. The cubic root of 2320640 is about 132.3942909097.

Adding to 2320640 its reverse (460232), we get a palindrome (2780872).

The spelling of 2320640 in words is "two million, three hundred twenty thousand, six hundred forty".