720925811 has 4 divisors (see below), whose sum is σ = 722154552. Its totient is φ = 719697072.

The previous prime is 720925789. The next prime is 720925867. The reversal of 720925811 is 118529027.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-720925811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720925411) 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 3 ways as a sum of consecutive naturals, for example, 613490 + ... + 614663.

It is an arithmetic number, because the mean of its divisors is an integer number (180538638).

Almost surely, 2^720925811 is an apocalyptic number.

720925811 is a deficient number, since it is larger than the sum of its proper divisors (1228741).

720925811 is a wasteful number, since it uses less digits than its factorization.

720925811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1228740.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 720925811 is about 26850.0616572849. The cubic root of 720925811 is about 896.6649453095.

The spelling of 720925811 in words is "seven hundred twenty million, nine hundred twenty-five thousand, eight hundred eleven".