720811641 has 24 divisors (see below), whose sum is σ = 1057901152. Its totient is φ = 436233600.

The previous prime is 720811583. The next prime is 720811643. The reversal of 720811641 is 146118027.

It is not a de Polignac number, because 720811641 - 2¹⁰ = 720810617 is a prime.

It is a super-2 number, since 2×720811641² = 1039138843602225762, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 720811599 and 720811608.

It is not an unprimeable number, because it can be changed into a prime (720811643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 470046 + ... + 471576.

Almost surely, 2^720811641 is an apocalyptic number.

It is an amenable number.

720811641 is a deficient number, since it is larger than the sum of its proper divisors (337089511).

720811641 is a wasteful number, since it uses less digits than its factorization.

720811641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2853 (or 2842 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 720811641 is about 26847.9355072229. The cubic root of 720811641 is about 896.6176091205.

Adding to 720811641 its reverse (146118027), we get a palindrome (866929668).

The spelling of 720811641 in words is "seven hundred twenty million, eight hundred eleven thousand, six hundred forty-one".