720320040 has 192 divisors, whose sum is σ = 2648842560. Its totient is φ = 174597120.

The previous prime is 720320023. The next prime is 720320053. The reversal of 720320040 is 40023027.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 720319995 and 720320022.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 103552 + ... + 110288.

It is an arithmetic number, because the mean of its divisors is an integer number (13796055).

Almost surely, 2^720320040 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 720320040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1324421280).

720320040 is an abundant number, since it is smaller than the sum of its proper divisors (1928522520).

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

720320040 is a wasteful number, since it uses less digits than its factorization.

720320040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6774 (or 6758 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 18.

The square root of 720320040 is about 26838.7786607364. The cubic root of 720320040 is about 896.4137286006.

Adding to 720320040 its reverse (40023027), we get a palindrome (760343067).

The spelling of 720320040 in words is "seven hundred twenty million, three hundred twenty thousand, forty".