8706640 has 40 divisors (see below), whose sum is σ = 20721888. Its totient is φ = 3400320.

The previous prime is 8706613. The next prime is 8706647. The reversal of 8706640 is 466078.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8706647) 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, 2175 + ... + 4705.

Almost surely, 2^8706640 is an apocalyptic number.

8706640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8706640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10360944).

8706640 is an abundant number, since it is smaller than the sum of its proper divisors (12015248).

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

8706640 is a wasteful number, since it uses less digits than its factorization.

8706640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2587 (or 2581 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 8706640 is about 2950.7016114816. The cubic root of 8706640 is about 205.7233222809.

The spelling of 8706640 in words is "eight million, seven hundred six thousand, six hundred forty".