6439788840 has 32 divisors (see below), whose sum is σ = 19319366880. Its totient is φ = 1717276992.

The previous prime is 6439788829. The next prime is 6439788851. The reversal of 6439788840 is 488879346.

It is an interprime number because it is at equal distance from previous prime (6439788829) and next prime (6439788851).

It is a super-3 number, since 3×6439788840³ (a number of 30 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26832334 + ... + 26832573.

It is an arithmetic number, because the mean of its divisors is an integer number (603730215).

Almost surely, 2^6439788840 is an apocalyptic number.

6439788840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6439788840 is an abundant number, since it is smaller than the sum of its proper divisors (12879578040).

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

6439788840 is a wasteful number, since it uses less digits than its factorization.

6439788840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53664921 (or 53664917 counting only the distinct ones).

The product of its (nonzero) digits is 9289728, while the sum is 57.

The square root of 6439788840 is about 80248.2949351573. The cubic root of 6439788840 is about 1860.4751589839.

The spelling of 6439788840 in words is "six billion, four hundred thirty-nine million, seven hundred eighty-eight thousand, eight hundred forty".