720422646 has 32 divisors (see below), whose sum is σ = 1461680640. Its totient is φ = 236679456.

The previous prime is 720422641. The next prime is 720422701. The reversal of 720422646 is 646224027.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720422641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 376825 + ... + 378731.

It is an arithmetic number, because the mean of its divisors is an integer number (45677520).

Almost surely, 2^720422646 is an apocalyptic number.

720422646 is an abundant number, since it is smaller than the sum of its proper divisors (741257994).

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

720422646 is a wasteful number, since it uses less digits than its factorization.

720422646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2788.

The product of its (nonzero) digits is 32256, while the sum is 33.

The square root of 720422646 is about 26840.6901178043. The cubic root of 720422646 is about 896.4562898025.

The spelling of 720422646 in words is "seven hundred twenty million, four hundred twenty-two thousand, six hundred forty-six".