6809780 has 48 divisors (see below), whose sum is σ = 15120000. Its totient is φ = 2572416.

The previous prime is 6809779. The next prime is 6809797. The reversal of 6809780 is 879086.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34121 + ... + 34319.

It is an arithmetic number, because the mean of its divisors is an integer number (315000).

Almost surely, 2^6809780 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6809780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7560000).

6809780 is an abundant number, since it is smaller than the sum of its proper divisors (8310220).

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

6809780 is a wasteful number, since it uses less digits than its factorization.

6809780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296 (or 294 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 6809780 is about 2609.5555177079. Note that the first 4 decimals coincide. The cubic root of 6809780 is about 189.5444302362.

The spelling of 6809780 in words is "six million, eight hundred nine thousand, seven hundred eighty".