720844805240 has 128 divisors (see below), whose sum is σ = 1901226539520. Its totient is φ = 240824102400.

The previous prime is 720844805237. The next prime is 720844805311. The reversal of 720844805240 is 42508448027.

It is a junction number, because it is equal to n+sod(n) for n = 720844805191 and 720844805200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4997735 + ... + 5139945.

It is an arithmetic number, because the mean of its divisors is an integer number (14853332340).

Almost surely, 2^720844805240 is an apocalyptic number.

720844805240 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 720844805240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (950613269760).

720844805240 is an abundant number, since it is smaller than the sum of its proper divisors (1180381734280).

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

720844805240 is a wasteful number, since it uses less digits than its factorization.

720844805240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142693 (or 142689 counting only the distinct ones).

The product of its (nonzero) digits is 573440, while the sum is 44.

The spelling of 720844805240 in words is "seven hundred twenty billion, eight hundred forty-four million, eight hundred five thousand, two hundred forty".