720776664 has 128 divisors (see below), whose sum is σ = 2079475200. Its totient is φ = 231154560.

The previous prime is 720776657. The next prime is 720776711. The reversal of 720776664 is 466677027.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 658902 + ... + 659994.

It is an arithmetic number, because the mean of its divisors is an integer number (16245900).

Almost surely, 2^720776664 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 720776664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1039737600).

720776664 is an abundant number, since it is smaller than the sum of its proper divisors (1358698536).

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

720776664 is a wasteful number, since it uses less digits than its factorization.

720776664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222 (or 1212 counting only the distinct ones).

The product of its (nonzero) digits is 592704, while the sum is 45.

The square root of 720776664 is about 26847.2841084531. The cubic root of 720776664 is about 896.6031062556.

The spelling of 720776664 in words is "seven hundred twenty million, seven hundred seventy-six thousand, six hundred sixty-four".