8649840 has 80 divisors (see below), whose sum is σ = 27998208. Its totient is φ = 2204928.

The previous prime is 8649803. The next prime is 8649847. The reversal of 8649840 is 489468.

8649840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8649847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4737 + ... + 6303.

Almost surely, 2^8649840 is an apocalyptic number.

8649840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8649840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13999104).

8649840 is an abundant number, since it is smaller than the sum of its proper divisors (19348368).

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

8649840 is a wasteful number, since it uses less digits than its factorization.

8649840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1606 (or 1600 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 8649840 is about 2941.0610330287. The cubic root of 8649840 is about 205.2749829514.

The spelling of 8649840 in words is "eight million, six hundred forty-nine thousand, eight hundred forty".