720221040 has 360 divisors, whose sum is σ = 3040992864. Its totient is φ = 149529600.

The previous prime is 720221017. The next prime is 720221041. The reversal of 720221040 is 40122027.

It is a tau number, because it is divible by the number of its divisors (360).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720221041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 609250 + ... + 610430.

Almost surely, 2^720221040 is an apocalyptic number.

720221040 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 720221040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1520496432).

720221040 is an abundant number, since it is smaller than the sum of its proper divisors (2320771824).

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

720221040 is a wasteful number, since it uses less digits than its factorization.

720221040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1229 (or 1209 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 720221040 is about 26836.9342511398. The cubic root of 720221040 is about 896.3726593442.

Adding to 720221040 its reverse (40122027), we get a palindrome (760343067).

The spelling of 720221040 in words is "seven hundred twenty million, two hundred twenty-one thousand, forty".