6861780 has 96 divisors (see below), whose sum is σ = 21732480. Its totient is φ = 1797120.

The previous prime is 6861773. The next prime is 6861791. The reversal of 6861780 is 871686.

6861780 is digitally balanced in base 4 and base 5, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52315 + ... + 52445.

It is an arithmetic number, because the mean of its divisors is an integer number (226380).

Almost surely, 2^6861780 is an apocalyptic number.

6861780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is a pronic number, being equal to 2619×2620.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6861780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10866240).

6861780 is an abundant number, since it is smaller than the sum of its proper divisors (14870700).

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

6861780 is a wasteful number, since it uses less digits than its factorization.

6861780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246 (or 238 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 6861780 is about 2619.4999522810. The cubic root of 6861780 is about 190.0256659695.

The spelling of 6861780 in words is "six million, eight hundred sixty-one thousand, seven hundred eighty".