720770816 has 72 divisors (see below), whose sum is σ = 1509036144. Its totient is φ = 343203840.

The previous prime is 720770807. The next prime is 720770851. The reversal of 720770816 is 618077027.

It is a self number, because there is not a number n which added to its sum of digits gives 720770816.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 450530 + ... + 452126.

Almost surely, 2^720770816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 720770816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (754518072).

720770816 is an abundant number, since it is smaller than the sum of its proper divisors (788265328).

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

720770816 is a wasteful number, since it uses less digits than its factorization.

720770816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1697 (or 1683 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 38.

The square root of 720770816 is about 26847.1751959121. The cubic root of 720770816 is about 896.6006813949.

The spelling of 720770816 in words is "seven hundred twenty million, seven hundred seventy thousand, eight hundred sixteen".