720217440 has 192 divisors, whose sum is σ = 2533809600. Its totient is φ = 191066112.

The previous prime is 720217373. The next prime is 720217441. The reversal of 720217440 is 44712027.

It is a happy number.

720217440 is a `hidden beast` number, since 7 + 2 + 0 + 217 + 440 = 666.

720217440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720217441) 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, 1265476 + ... + 1266044.

It is an arithmetic number, because the mean of its divisors is an integer number (13196925).

Almost surely, 2^720217440 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 720217440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1266904800).

720217440 is an abundant number, since it is smaller than the sum of its proper divisors (1813592160).

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

720217440 is a wasteful number, since it uses less digits than its factorization.

720217440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886 (or 872 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 27.

The square root of 720217440 is about 26836.8671793114. The cubic root of 720217440 is about 896.3711658458.

Adding to 720217440 its reverse (44712027), we get a palindrome (764929467).

It can be divided in two parts, 7202 and 17440, that added together give a palindrome (24642).

The spelling of 720217440 in words is "seven hundred twenty million, two hundred seventeen thousand, four hundred forty".