720728584245 has 24 divisors (see below), whose sum is σ = 1249330203576. Its totient is φ = 384367863168.

The previous prime is 720728584243. The next prime is 720728584259. The reversal of 720728584245 is 542485827027.

It is a happy number.

720728584245 is a `hidden beast` number, since 7 + 207 + 2 + 8 + 5 + 8 + 424 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 54103690404 + 666624893841 = 232602^2 + 816471^2 .

It is not a de Polignac number, because 720728584245 - 2¹ = 720728584243 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 720728584191 and 720728584200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720728584243) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 431707 + ... + 1275863.

It is an arithmetic number, because the mean of its divisors is an integer number (52055425149).

Almost surely, 2^720728584245 is an apocalyptic number.

It is an amenable number.

720728584245 is a deficient number, since it is larger than the sum of its proper divisors (528601619331).

720728584245 is a wasteful number, since it uses less digits than its factorization.

720728584245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863141 (or 863138 counting only the distinct ones).

The product of its (nonzero) digits is 10035200, while the sum is 54.

The spelling of 720728584245 in words is "seven hundred twenty billion, seven hundred twenty-eight million, five hundred eighty-four thousand, two hundred forty-five".