6489840 has 80 divisors (see below), whose sum is σ = 22998528. Its totient is φ = 1483008.

The previous prime is 6489839. The next prime is 6489859. The reversal of 6489840 is 489846.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 252 + ... + 3611.

Almost surely, 2^6489840 is an apocalyptic number.

6489840 is a gapful number since it is divisible by the number (60) 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 6489840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11499264).

6489840 is an abundant number, since it is smaller than the sum of its proper divisors (16508688).

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

6489840 is a wasteful number, since it uses less digits than its factorization.

6489840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3886 (or 3880 counting only the distinct ones).

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

The square root of 6489840 is about 2547.5164376310. The cubic root of 6489840 is about 186.5282704331.

The spelling of 6489840 in words is "six million, four hundred eighty-nine thousand, eight hundred forty".