8640906 has 16 divisors (see below), whose sum is σ = 17749344. Its totient is φ = 2802384.

The previous prime is 8640889. The next prime is 8640911. The reversal of 8640906 is 6090468.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19240 + ... + 19683.

It is an arithmetic number, because the mean of its divisors is an integer number (1109334).

Almost surely, 2^8640906 is an apocalyptic number.

8640906 is an abundant number, since it is smaller than the sum of its proper divisors (9108438).

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

8640906 is a wasteful number, since it uses less digits than its factorization.

8640906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38965.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 8640906 is about 2939.5418010295. The cubic root of 8640906 is about 205.2042857496.

The spelling of 8640906 in words is "eight million, six hundred forty thousand, nine hundred six".