720247840538 has 8 divisors (see below), whose sum is σ = 1091068511220. Its totient is φ = 356558336800.

The previous prime is 720247840483. The next prime is 720247840591. The reversal of 720247840538 is 835048742027.

It can be written as a sum of positive squares in 2 ways, for example, as 571071910249 + 149175930289 = 755693^2 + 386233^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×720247840538² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1782791483 + ... + 1782791886.

Almost surely, 2^720247840538 is an apocalyptic number.

720247840538 is a deficient number, since it is larger than the sum of its proper divisors (370820670682).

720247840538 is a wasteful number, since it uses less digits than its factorization.

720247840538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3565583472.

The product of its (nonzero) digits is 3010560, while the sum is 50.

The spelling of 720247840538 in words is "seven hundred twenty billion, two hundred forty-seven million, eight hundred forty thousand, five hundred thirty-eight".