6878543440 has 20 divisors (see below), whose sum is σ = 15992613684. Its totient is φ = 2751417344.

The previous prime is 6878543339. The next prime is 6878543447. The reversal of 6878543440 is 443458786.

It can be written as a sum of positive squares in 2 ways, for example, as 2953270336 + 3925273104 = 54344^2 + 62652^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6878543447) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 42990817 + ... + 42990976.

Almost surely, 2^6878543440 is an apocalyptic number.

It is an amenable number.

6878543440 is an abundant number, since it is smaller than the sum of its proper divisors (9114070244).

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

6878543440 is a wasteful number, since it uses less digits than its factorization.

6878543440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85981806 (or 85981800 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 49.

The square root of 6878543440 is about 82936.9847534862. The cubic root of 6878543440 is about 1901.8028538811.

It can be divided in two parts, 68785 and 43440, that added together give a square (112225 = 335²).

The spelling of 6878543440 in words is "six billion, eight hundred seventy-eight million, five hundred forty-three thousand, four hundred forty".