6640500 has 96 divisors (see below), whose sum is σ = 20442240. Its totient is φ = 1670400.

The previous prime is 6640499. The next prime is 6640511. The reversal of 6640500 is 50466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28384 + ... + 28616.

It is an arithmetic number, because the mean of its divisors is an integer number (212940).

Almost surely, 2^6640500 is an apocalyptic number.

6640500 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 6640500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10221120).

6640500 is an abundant number, since it is smaller than the sum of its proper divisors (13801740).

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

6640500 is a wasteful number, since it uses less digits than its factorization.

6640500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274 (or 262 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 6640500 is about 2576.9167623344. The cubic root of 6640500 is about 187.9606451499.

Adding to 6640500 its reverse (50466), we get a palindrome (6690966).

It can be divided in two parts, 6640 and 500, that added together give a triangular number (7140 = T₁₁₉).

The spelling of 6640500 in words is "six million, six hundred forty thousand, five hundred".