8081640 has 128 divisors (see below), whose sum is σ = 30816000. Its totient is φ = 1845504.

The previous prime is 8081629. The next prime is 8081641. The reversal of 8081640 is 461808.

8081640 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (8081641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7026 + ... + 8094.

It is an arithmetic number, because the mean of its divisors is an integer number (240750).

Almost surely, 2^8081640 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 8081640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15408000).

8081640 is an abundant number, since it is smaller than the sum of its proper divisors (22734360).

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

8081640 is a wasteful number, since it uses less digits than its factorization.

8081640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1096 (or 1086 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 8081640 is about 2842.8225410672. The cubic root of 8081640 is about 200.6780320981.

The spelling of 8081640 in words is "eight million, eighty-one thousand, six hundred forty".