8618640 has 40 divisors (see below), whose sum is σ = 26718528. Its totient is φ = 2298240.

The previous prime is 8618639. The next prime is 8618681. The reversal of 8618640 is 468168.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17716 + ... + 18195.

Almost surely, 2^8618640 is an apocalyptic number.

8618640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8618640 is an abundant number, since it is smaller than the sum of its proper divisors (18099888).

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

8618640 is a wasteful number, since it uses less digits than its factorization.

8618640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35927 (or 35921 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 8618640 is about 2935.7520331254. The cubic root of 8618640 is about 205.0278764391.

The spelling of 8618640 in words is "eight million, six hundred eighteen thousand, six hundred forty".