6500420440 has 64 divisors (see below), whose sum is σ = 15075214560. Its totient is φ = 2521082880.

The previous prime is 6500420419. The next prime is 6500420461. The reversal of 6500420440 is 440240056.

It is an interprime number because it is at equal distance from previous prime (6500420419) and next prime (6500420461).

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, 255162 + ... + 279478.

Almost surely, 2^6500420440 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 6500420440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7537607280).

6500420440 is an abundant number, since it is smaller than the sum of its proper divisors (8574794120).

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

6500420440 is a wasteful number, since it uses less digits than its factorization.

6500420440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24532 (or 24528 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 6500420440 is about 80625.1848990128. The cubic root of 6500420440 is about 1866.2958159255.

Adding to 6500420440 its reverse (440240056), we get a palindrome (6940660496).

The spelling of 6500420440 in words is "six billion, five hundred million, four hundred twenty thousand, four hundred forty".