7320640 has 28 divisors (see below), whose sum is σ = 17433036. Its totient is φ = 2928128.

The previous prime is 7320637. The next prime is 7320653. The reversal of 7320640 is 460237.

It can be written as a sum of positive squares in 2 ways, for example, as 4734976 + 2585664 = 2176^2 + 1608^2 .

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, 11119 + ... + 11758.

Almost surely, 2^7320640 is an apocalyptic number.

It is an amenable number.

7320640 is an abundant number, since it is smaller than the sum of its proper divisors (10112396).

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

7320640 is a wasteful number, since it uses less digits than its factorization.

7320640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22894 (or 22884 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 7320640 is about 2705.6681245119. The cubic root of 7320640 is about 194.1703962231.

Adding to 7320640 its reverse (460237), we get a palindrome (7780877).

The spelling of 7320640 in words is "seven million, three hundred twenty thousand, six hundred forty".