8685440 has 64 divisors (see below), whose sum is σ = 21334320. Its totient is φ = 3379200.

The previous prime is 8685409. The next prime is 8685463. The reversal of 8685440 is 445868.

8685440 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 8685440.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26075 + ... + 26405.

Almost surely, 2^8685440 is an apocalyptic number.

8685440 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 8685440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10667160).

8685440 is an abundant number, since it is smaller than the sum of its proper divisors (12648880).

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

8685440 is a wasteful number, since it uses less digits than its factorization.

8685440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391 (or 379 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 35.

The square root of 8685440 is about 2947.1070560806. The cubic root of 8685440 is about 205.5562130758.

The spelling of 8685440 in words is "eight million, six hundred eighty-five thousand, four hundred forty".