6543990 has 48 divisors (see below), whose sum is σ = 17651088. Its totient is φ = 1744416.

The previous prime is 6543989. The next prime is 6544003. The reversal of 6543990 is 993456.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1084 + ... + 3776.

It is an arithmetic number, because the mean of its divisors is an integer number (367731).

Almost surely, 2^6543990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6543990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8825544).

6543990 is an abundant number, since it is smaller than the sum of its proper divisors (11107098).

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

6543990 is a wasteful number, since it uses less digits than its factorization.

6543990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2715 (or 2703 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 6543990 is about 2558.1223582933. The cubic root of 6543990 is about 187.0456197620.

The spelling of 6543990 in words is "six million, five hundred forty-three thousand, nine hundred ninety".