647640111 has 16 divisors (see below), whose sum is σ = 878614400. Its totient is φ = 424228320.

The previous prime is 647640083. The next prime is 647640113. The reversal of 647640111 is 111046746.

647640111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 647640111 - 2⁶ = 647640047 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 (647640113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 309876 + ... + 311958.

It is an arithmetic number, because the mean of its divisors is an integer number (54913400).

Almost surely, 2^647640111 is an apocalyptic number.

647640111 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

647640111 is a deficient number, since it is larger than the sum of its proper divisors (230974289).

647640111 is a wasteful number, since it uses less digits than its factorization.

647640111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3846.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 647640111 is about 25448.7742533899. The cubic root of 647640111 is about 865.1895119758.

Adding to 647640111 its reverse (111046746), we get a palindrome (758686857).

The spelling of 647640111 in words is "six hundred forty-seven million, six hundred forty thousand, one hundred eleven".