8091640 has 16 divisors (see below), whose sum is σ = 18206280. Its totient is φ = 3236640.

The previous prime is 8091617. The next prime is 8091679. The reversal of 8091640 is 461908.

It is a junction number, because it is equal to n+sod(n) for n = 8091599 and 8091608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101106 + ... + 101185.

Almost surely, 2^8091640 is an apocalyptic number.

It is an amenable number.

8091640 is an abundant number, since it is smaller than the sum of its proper divisors (10114640).

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

8091640 is a wasteful number, since it uses less digits than its factorization.

8091640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202302 (or 202298 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 8091640 is about 2844.5808127033. The cubic root of 8091640 is about 200.7607691489.

The spelling of 8091640 in words is "eight million, ninety-one thousand, six hundred forty".