6653840 has 40 divisors (see below), whose sum is σ = 15975168. Its totient is φ = 2574720.

The previous prime is 6653839. The next prime is 6653869. The reversal of 6653840 is 483566.

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

It is a junction number, because it is equal to n+sod(n) for n = 6653797 and 6653806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1139 + ... + 3821.

Almost surely, 2^6653840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6653840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7987584).

6653840 is an abundant number, since it is smaller than the sum of its proper divisors (9321328).

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

6653840 is a wasteful number, since it uses less digits than its factorization.

6653840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2727 (or 2721 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 6653840 is about 2579.5038282585. The cubic root of 6653840 is about 188.0864247275.

The spelling of 6653840 in words is "six million, six hundred fifty-three thousand, eight hundred forty".