8640705 has 16 divisors (see below), whose sum is σ = 13869504. Its totient is φ = 4593600.

The previous prime is 8640703. The next prime is 8640707. The reversal of 8640705 is 5070468.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (8640703) and next prime (8640707).

It is not a de Polignac number, because 8640705 - 2¹ = 8640703 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8640701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5230 + ... + 6680.

It is an arithmetic number, because the mean of its divisors is an integer number (866844).

Almost surely, 2^8640705 is an apocalyptic number.

It is an amenable number.

8640705 is a deficient number, since it is larger than the sum of its proper divisors (5228799).

8640705 is a wasteful number, since it uses less digits than its factorization.

8640705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1856.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 8640705 is about 2939.5076118289. The cubic root of 8640705 is about 205.2026946209.

The spelling of 8640705 in words is "eight million, six hundred forty thousand, seven hundred five".