720640111 has 8 divisors (see below), whose sum is σ = 746799120. Its totient is φ = 694568448.

The previous prime is 720640091. The next prime is 720640147. The reversal of 720640111 is 111046027.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 720640111 - 2¹¹ = 720638063 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 (720640511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4801 + ... + 38266.

It is an arithmetic number, because the mean of its divisors is an integer number (93349890).

Almost surely, 2^720640111 is an apocalyptic number.

720640111 is a deficient number, since it is larger than the sum of its proper divisors (26159009).

720640111 is a wasteful number, since it uses less digits than its factorization.

720640111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43673.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 720640111 is about 26844.7408443442. The cubic root of 720640111 is about 896.5464814218.

Adding to 720640111 its reverse (111046027), we get a palindrome (831686138).

The spelling of 720640111 in words is "seven hundred twenty million, six hundred forty thousand, one hundred eleven".