11802780 has 96 divisors (see below), whose sum is σ = 40078080. Its totient is φ = 2859840.

The previous prime is 11802779. The next prime is 11802799. The reversal of 11802780 is 8720811.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 4947 + ... + 6933.

It is an arithmetic number, because the mean of its divisors is an integer number (417480).

Almost surely, 2^11802780 is an apocalyptic number.

11802780 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 11802780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20039040).

11802780 is an abundant number, since it is smaller than the sum of its proper divisors (28275300).

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

11802780 is a wasteful number, since it uses less digits than its factorization.

11802780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2016 (or 2008 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 11802780 is about 3435.5174282777. The cubic root of 11802780 is about 227.6816887759.

The spelling of 11802780 in words is "eleven million, eight hundred two thousand, seven hundred eighty".