720628245 has 20 divisors (see below), whose sum is σ = 1291793580. Its totient is φ = 384334848.

The previous prime is 720628241. The next prime is 720628247. The reversal of 720628245 is 542826027.

720628245 is a `hidden beast` number, since 7 + 2 + 0 + 628 + 24 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 343064484 + 377563761 = 18522^2 + 19431^2 .

It is not a de Polignac number, because 720628245 - 2² = 720628241 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720628241) 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 19 ways as a sum of consecutive naturals, for example, 889260 + ... + 890069.

It is an arithmetic number, because the mean of its divisors is an integer number (64589679).

Almost surely, 2^720628245 is an apocalyptic number.

It is an amenable number.

720628245 is a deficient number, since it is larger than the sum of its proper divisors (571165335).

720628245 is a wasteful number, since it uses less digits than its factorization.

720628245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1779346 (or 1779337 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 720628245 is about 26844.5198318018. The cubic root of 720628245 is about 896.5415605749.

The spelling of 720628245 in words is "seven hundred twenty million, six hundred twenty-eight thousand, two hundred forty-five".