720737225 has 24 divisors (see below), whose sum is σ = 966318360. Its totient is φ = 530104320.

The previous prime is 720737221. The next prime is 720737239. The reversal of 720737225 is 522737027.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 46607929 + 674129296 = 6827^2 + 25964^2 .

It is not a de Polignac number, because 720737225 - 2² = 720737221 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (720737221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79211 + ... + 87839.

It is an arithmetic number, because the mean of its divisors is an integer number (40263265).

Almost surely, 2^720737225 is an apocalyptic number.

It is an amenable number.

720737225 is a deficient number, since it is larger than the sum of its proper divisors (245581135).

720737225 is a wasteful number, since it uses less digits than its factorization.

720737225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8909 (or 8904 counting only the distinct ones).

The product of its (nonzero) digits is 41160, while the sum is 35.

The square root of 720737225 is about 26846.5495920798. The cubic root of 720737225 is about 896.5867527041.

The spelling of 720737225 in words is "seven hundred twenty million, seven hundred thirty-seven thousand, two hundred twenty-five".