720000640 has 32 divisors (see below), whose sum is σ = 1721253060. Its totient is φ = 288000000.

The previous prime is 720000607. The next prime is 720000641. The reversal of 720000640 is 46000027.

It can be written as a sum of positive squares in 2 ways, for example, as 710115904 + 9884736 = 26648^2 + 3144^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (720000641) 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 3 ways as a sum of consecutive naturals, for example, 561861 + ... + 563140.

Almost surely, 2^720000640 is an apocalyptic number.

It is an amenable number.

720000640 is an abundant number, since it is smaller than the sum of its proper divisors (1001252420).

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

720000640 is a wasteful number, since it uses less digits than its factorization.

720000640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1125020 (or 1125008 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 720000640 is about 26832.8276556907. The cubic root of 720000640 is about 896.2812148761.

Adding to 720000640 its reverse (46000027), we get a palindrome (766000667).

The spelling of 720000640 in words is "seven hundred twenty million, six hundred forty", and thus it is an aban number.