8709640 has 32 divisors (see below), whose sum is σ = 20450880. Its totient is φ = 3332032.

The previous prime is 8709611. The next prime is 8709647. The reversal of 8709640 is 469078.

It is a junction number, because it is equal to n+sod(n) for n = 8709596 and 8709605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8709647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3814 + ... + 5653.

It is an arithmetic number, because the mean of its divisors is an integer number (639090).

Almost surely, 2^8709640 is an apocalyptic number.

It is an amenable number.

8709640 is an abundant number, since it is smaller than the sum of its proper divisors (11741240).

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

8709640 is a wasteful number, since it uses less digits than its factorization.

8709640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9501 (or 9497 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 8709640 is about 2951.2099213712. The cubic root of 8709640 is about 205.7469478929.

The spelling of 8709640 in words is "eight million, seven hundred nine thousand, six hundred forty".