8640408 has 32 divisors (see below), whose sum is σ = 24687360. Its totient is φ = 2468640.

The previous prime is 8640407. The next prime is 8640409. The reversal of 8640408 is 8040468.

8640408 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (8640407) and next prime (8640409).

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

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 in 7 ways as a sum of consecutive naturals, for example, 25548 + ... + 25883.

It is an arithmetic number, because the mean of its divisors is an integer number (771480).

Almost surely, 2^8640408 is an apocalyptic number.

It is an amenable number.

8640408 is an abundant number, since it is smaller than the sum of its proper divisors (16046952).

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

8640408 is a wasteful number, since it uses less digits than its factorization.

8640408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51447 (or 51443 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 8640408 is about 2939.4570927299. The cubic root of 8640408 is about 205.2003435049.

The spelling of 8640408 in words is "eight million, six hundred forty thousand, four hundred eight".