6440024220 has 96 divisors (see below), whose sum is σ = 20688611328. Its totient is φ = 1466253312.

The previous prime is 6440024191. The next prime is 6440024251. The reversal of 6440024220 is 224200446.

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, 78109 + ... + 137771.

It is an arithmetic number, because the mean of its divisors is an integer number (215506368).

Almost surely, 2^6440024220 is an apocalyptic number.

6440024220 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 6440024220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10344305664).

6440024220 is an abundant number, since it is smaller than the sum of its proper divisors (14248587108).

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

6440024220 is a wasteful number, since it uses less digits than its factorization.

6440024220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59939 (or 59937 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 6440024220 is about 80249.7614949727. The cubic root of 6440024220 is about 1860.4978260474.

Adding to 6440024220 its reverse (224200446), we get a palindrome (6664224666).

The spelling of 6440024220 in words is "six billion, four hundred forty million, twenty-four thousand, two hundred twenty".