720204517 has 4 divisors (see below), whose sum is σ = 720308556. Its totient is φ = 720100480.

The previous prime is 720204509. The next prime is 720204521. The reversal of 720204517 is 715402027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 715402027 = 449 ⋅1593323.

It can be written as a sum of positive squares in 2 ways, for example, as 79405921 + 640798596 = 8911^2 + 25314^2 .

It is a cyclic number.

It is not a de Polignac number, because 720204517 - 2³ = 720204509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720204577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40834 + ... + 55747.

It is an arithmetic number, because the mean of its divisors is an integer number (180077139).

Almost surely, 2^720204517 is an apocalyptic number.

It is an amenable number.

720204517 is a deficient number, since it is larger than the sum of its proper divisors (104039).

720204517 is an equidigital number, since it uses as much as digits as its factorization.

720204517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104038.

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 720204517 is about 26836.6264086975. The cubic root of 720204517 is about 896.3658045604.

The spelling of 720204517 in words is "seven hundred twenty million, two hundred four thousand, five hundred seventeen".