720641311 has 4 divisors (see below), whose sum is σ = 776075272. Its totient is φ = 665207352.

The previous prime is 720641279. The next prime is 720641351. The reversal of 720641311 is 113146027.

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

It is a cyclic number.

It is not a de Polignac number, because 720641311 - 2⁵ = 720641279 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 (720641351) 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, 27716961 + ... + 27716986.

It is an arithmetic number, because the mean of its divisors is an integer number (194018818).

Almost surely, 2^720641311 is an apocalyptic number.

720641311 is a deficient number, since it is larger than the sum of its proper divisors (55433961).

720641311 is a wasteful number, since it uses less digits than its factorization.

720641311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55433960.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 720641311 is about 26844.7631950815. The cubic root of 720641311 is about 896.5469790604.

Adding to 720641311 its reverse (113146027), we get a palindrome (833787338).

The spelling of 720641311 in words is "seven hundred twenty million, six hundred forty-one thousand, three hundred eleven".