720228809537 has 18 divisors (see below), whose sum is σ = 783903850758. Its totient is φ = 659423244672.

The previous prime is 720228809519. The next prime is 720228809623. The reversal of 720228809537 is 735908822027.

It can be written as a sum of positive squares in 3 ways, for example, as 507035140096 + 213193669441 = 712064^2 + 461729^2 .

It is not a de Polignac number, because 720228809537 - 2⁶ = 720228809473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720228809137) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 129464918 + ... + 129470480.

It is an arithmetic number, because the mean of its divisors is an integer number (43550213931).

Almost surely, 2^720228809537 is an apocalyptic number.

It is an amenable number.

720228809537 is a deficient number, since it is larger than the sum of its proper divisors (63675041221).

720228809537 is an frugal number, since it uses more digits than its factorization.

720228809537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11217 (or 5617 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 53.

The spelling of 720228809537 in words is "seven hundred twenty billion, two hundred twenty-eight million, eight hundred nine thousand, five hundred thirty-seven".