11681780 has 48 divisors (see below), whose sum is σ = 27699840. Its totient is φ = 4099200.

The previous prime is 11681779. The next prime is 11681801. The reversal of 11681780 is 8718611.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5465 + ... + 7295.

It is an arithmetic number, because the mean of its divisors is an integer number (577080).

Almost surely, 2^11681780 is an apocalyptic number.

11681780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11681780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13849920).

11681780 is an abundant number, since it is smaller than the sum of its proper divisors (16018060).

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

11681780 is a wasteful number, since it uses less digits than its factorization.

11681780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1880 (or 1878 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 32.

The square root of 11681780 is about 3417.8619047586. The cubic root of 11681780 is about 226.9009639985.

The spelling of 11681780 in words is "eleven million, six hundred eighty-one thousand, seven hundred eighty".