8099640 has 96 divisors (see below), whose sum is σ = 26676000. Its totient is φ = 2131200.

The previous prime is 8099639. The next prime is 8099653. The reversal of 8099640 is 469908.

8099640 is a `hidden beast` number, since 8 + 0 + 9 + 9 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 8099595 and 8099604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53565 + ... + 53715.

It is an arithmetic number, because the mean of its divisors is an integer number (277875).

Almost surely, 2^8099640 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 8099640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13338000).

8099640 is an abundant number, since it is smaller than the sum of its proper divisors (18576360).

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

8099640 is a wasteful number, since it uses less digits than its factorization.

8099640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317 (or 310 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 8099640 is about 2845.9866478956. The cubic root of 8099640 is about 200.8269097230.

The spelling of 8099640 in words is "eight million, ninety-nine thousand, six hundred forty".