8111640 has 64 divisors (see below), whose sum is σ = 25401600. Its totient is φ = 2068352.

The previous prime is 8111639. The next prime is 8111657. The reversal of 8111640 is 461118.

8111640 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1291 + ... + 4229.

It is an arithmetic number, because the mean of its divisors is an integer number (396900).

Almost surely, 2^8111640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8111640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12700800).

8111640 is an abundant number, since it is smaller than the sum of its proper divisors (17289960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8111640 is a wasteful number, since it uses less digits than its factorization.

8111640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2976 (or 2972 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 8111640 is about 2848.0940995690. The cubic root of 8111640 is about 200.9260389747.

Adding to 8111640 its reverse (461118), we get a palindrome (8572758).

The spelling of 8111640 in words is "eight million, one hundred eleven thousand, six hundred forty".