6440260020 has 96 divisors (see below), whose sum is σ = 18625324032. Its totient is φ = 1661856768.

The previous prime is 6440260009. The next prime is 6440260063. The reversal of 6440260020 is 200620446.

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, 218269 + ... + 246011.

It is an arithmetic number, because the mean of its divisors is an integer number (194013792).

Almost surely, 2^6440260020 is an apocalyptic number.

6440260020 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 6440260020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9312662016).

6440260020 is an abundant number, since it is smaller than the sum of its proper divisors (12185064012).

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

6440260020 is a wasteful number, since it uses less digits than its factorization.

6440260020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27881 (or 27879 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 6440260020 is about 80251.2306447696. The cubic root of 6440260020 is about 1860.5205330031.

Adding to 6440260020 its reverse (200620446), we get a palindrome (6640880466).

The spelling of 6440260020 in words is "six billion, four hundred forty million, two hundred sixty thousand, twenty".