8640890 has 16 divisors (see below), whose sum is σ = 15587208. Its totient is φ = 3448896.

The previous prime is 8640889. The next prime is 8640911. The reversal of 8640890 is 980468.

It can be written as a sum of positive squares in 4 ways, for example, as 1739761 + 6901129 = 1319^2 + 2627^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 8640890.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8024 + ... + 9036.

Almost surely, 2^8640890 is an apocalyptic number.

8640890 is a deficient number, since it is larger than the sum of its proper divisors (6946318).

8640890 is a wasteful number, since it uses less digits than its factorization.

8640890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1873.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 8640890 is about 2939.5390795157. The cubic root of 8640890 is about 205.2041590935.

The spelling of 8640890 in words is "eight million, six hundred forty thousand, eight hundred ninety".