8640404 has 6 divisors (see below), whose sum is σ = 15120714. Its totient is φ = 4320200.

The previous prime is 8640391. The next prime is 8640407. The reversal of 8640404 is 4040468.

8640404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 5750404 + 2890000 = 2398^2 + 1700^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8640407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080047 + ... + 1080054.

It is an arithmetic number, because the mean of its divisors is an integer number (2520119).

Almost surely, 2^8640404 is an apocalyptic number.

It is an amenable number.

8640404 is a deficient number, since it is larger than the sum of its proper divisors (6480310).

8640404 is a wasteful number, since it uses less digits than its factorization.

8640404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2160105 (or 2160103 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 8640404 is about 2939.4564123320. The cubic root of 8640404 is about 205.2003118397.

The spelling of 8640404 in words is "eight million, six hundred forty thousand, four hundred four".