720809490025 has 27 divisors (see below), whose sum is σ = 898507896111. Its totient is φ = 573628530240.

The previous prime is 720809490017. The next prime is 720809490031. The reversal of 720809490025 is 520094908027.

The square root of 720809490025 is 849005.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 588898155609 + 131911334416 = 767397^2 + 363196^2 .

It is not a de Polignac number, because 720809490025 - 2³ = 720809490017 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1175871619 + ... + 1175872231.

Almost surely, 2^720809490025 is an apocalyptic number.

720809490025 is the 849005-th square number.

720809490025 is the 424503-rd centered octagonal number.

It is an amenable number.

720809490025 is a deficient number, since it is larger than the sum of its proper divisors (177698406086).

720809490025 is an frugal number, since it uses more digits than its factorization.

720809490025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1790 (or 895 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 720809490025 in words is "seven hundred twenty billion, eight hundred nine million, four hundred ninety thousand, twenty-five".