720647780 has 24 divisors (see below), whose sum is σ = 1515067008. Its totient is φ = 287934048.

The previous prime is 720647777. The next prime is 720647783. The reversal of 720647780 is 87746027.

720647780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (720647777) and next prime (720647783).

It is not an unprimeable number, because it can be changed into a prime (720647783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1724 + ... + 38003.

It is an arithmetic number, because the mean of its divisors is an integer number (63127792).

Almost surely, 2^720647780 is an apocalyptic number.

It is an amenable number.

720647780 is an abundant number, since it is smaller than the sum of its proper divisors (794419228).

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

720647780 is a wasteful number, since it uses less digits than its factorization.

720647780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40643 (or 40641 counting only the distinct ones).

The product of its (nonzero) digits is 131712, while the sum is 41.

The square root of 720647780 is about 26844.8836838605. The cubic root of 720647780 is about 896.5496617381.

The spelling of 720647780 in words is "seven hundred twenty million, six hundred forty-seven thousand, seven hundred eighty".