720648864 has 144 divisors (see below), whose sum is σ = 2238897024. Its totient is φ = 218534400.

The previous prime is 720648839. The next prime is 720648881. The reversal of 720648864 is 468846027.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 264469 + ... + 267179.

It is an arithmetic number, because the mean of its divisors is an integer number (15547896).

Almost surely, 2^720648864 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 720648864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1119448512).

720648864 is an abundant number, since it is smaller than the sum of its proper divisors (1518248160).

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

720648864 is a wasteful number, since it uses less digits than its factorization.

720648864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2811 (or 2800 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 45.

The square root of 720648864 is about 26844.9038739199. The cubic root of 720648864 is about 896.5501112685.

The spelling of 720648864 in words is "seven hundred twenty million, six hundred forty-eight thousand, eight hundred sixty-four".