720538281 has 8 divisors (see below), whose sum is σ = 1067464160. Its totient is φ = 480358836.

The previous prime is 720538279. The next prime is 720538297. The reversal of 720538281 is 182835027.

720538281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 720538281 - 2¹ = 720538279 is a prime.

It is a super-2 number, since 2×720538281² = 1038350828772869922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720538241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13343275 + ... + 13343328.

It is an arithmetic number, because the mean of its divisors is an integer number (133433020).

Almost surely, 2^720538281 is an apocalyptic number.

It is an amenable number.

720538281 is a deficient number, since it is larger than the sum of its proper divisors (346925879).

720538281 is a wasteful number, since it uses less digits than its factorization.

720538281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26686612 (or 26686606 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 720538281 is about 26842.8441302333. The cubic root of 720538281 is about 896.5042506201.

The spelling of 720538281 in words is "seven hundred twenty million, five hundred thirty-eight thousand, two hundred eighty-one".