6500640 has 96 divisors (see below), whose sum is σ = 21228480. Its totient is φ = 1670144.

The previous prime is 6500633. The next prime is 6500677. The reversal of 6500640 is 460056.

6500640 = T₂₂₄ + T₂₂₅ + ... + T₃₆₈.

It is a tau number, because it is divible by the number of its divisors (96).

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, 13687 + ... + 14153.

It is an arithmetic number, because the mean of its divisors is an integer number (221130).

Almost surely, 2^6500640 is an apocalyptic number.

6500640 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 6500640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10614240).

6500640 is an abundant number, since it is smaller than the sum of its proper divisors (14727840).

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

6500640 is a wasteful number, since it uses less digits than its factorization.

6500640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514 (or 506 counting only the distinct ones).

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

The square root of 6500640 is about 2549.6352680334. The cubic root of 6500640 is about 186.6316827864.

Adding to 6500640 its reverse (460056), we get a palindrome (6960696).

It can be divided in two parts, 6500 and 640, that added together give a triangular number (7140 = T₁₁₉).

The spelling of 6500640 in words is "six million, five hundred thousand, six hundred forty".