6781878 has 48 divisors (see below), whose sum is σ = 16005600. Its totient is φ = 2066688.

The previous prime is 6781867. The next prime is 6781891. The reversal of 6781878 is 8781876.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11023 + ... + 11621.

It is an arithmetic number, because the mean of its divisors is an integer number (333450).

Almost surely, 2^6781878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6781878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8002800).

6781878 is an abundant number, since it is smaller than the sum of its proper divisors (9223722).

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

6781878 is a wasteful number, since it uses less digits than its factorization.

6781878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661 (or 658 counting only the distinct ones).

The product of its digits is 150528, while the sum is 45.

The square root of 6781878 is about 2604.2039090670. The cubic root of 6781878 is about 189.2851997206.

It can be divided in two parts, 67818 and 78, that added together give a triangular number (67896 = T₃₆₈).

The spelling of 6781878 in words is "six million, seven hundred eighty-one thousand, eight hundred seventy-eight".