720321720 has 128 divisors (see below), whose sum is σ = 2245320000. Its totient is φ = 184647680.

The previous prime is 720321703. The next prime is 720321727. The reversal of 720321720 is 27123027.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720321727) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1562290 + ... + 1562750.

Almost surely, 2^720321720 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 720321720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1122660000).

720321720 is an abundant number, since it is smaller than the sum of its proper divisors (1524998280).

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

720321720 is a wasteful number, since it uses less digits than its factorization.

720321720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953 (or 949 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 720321720 is about 26838.8099587146. The cubic root of 720321720 is about 896.4144255009.

Adding to 720321720 its reverse (27123027), we get a palindrome (747444747).

The spelling of 720321720 in words is "seven hundred twenty million, three hundred twenty-one thousand, seven hundred twenty".