6439026860640 has 1152 divisors, whose sum is σ = 27492318604800. Its totient is φ = 1391773777920.

The previous prime is 6439026860633. The next prime is 6439026860653. The reversal of 6439026860640 is 460686209346.

6439026860640 is a `hidden beast` number, since 6 + 4 + 3 + 9 + 0 + 26 + 8 + 606 + 4 + 0 = 666.

It is a super-2 number, since 2×6439026860640² (a number of 26 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 260919982 + ... + 260944658.

It is an arithmetic number, because the mean of its divisors is an integer number (23864859900).

Almost surely, 2^{6439026860640} is an apocalyptic number.

6439026860640 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 6439026860640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13746159302400).

6439026860640 is an abundant number, since it is smaller than the sum of its proper divisors (21053291744160).

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

6439026860640 is a wasteful number, since it uses less digits than its factorization.

6439026860640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24765 (or 24734 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 54.

The spelling of 6439026860640 in words is "six trillion, four hundred thirty-nine billion, twenty-six million, eight hundred sixty thousand, six hundred forty".