11777820 has 48 divisors (see below), whose sum is σ = 33442080. Its totient is φ = 3096576.

The previous prime is 11777791. The next prime is 11777833. The reversal of 11777820 is 2877711.

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, 3036 + ... + 5724.

It is an arithmetic number, because the mean of its divisors is an integer number (696710).

Almost surely, 2^11777820 is an apocalyptic number.

11777820 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 11777820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16721040).

11777820 is an abundant number, since it is smaller than the sum of its proper divisors (21664260).

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

11777820 is a wasteful number, since it uses less digits than its factorization.

11777820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2774 (or 2772 counting only the distinct ones).

The product of its (nonzero) digits is 5488, while the sum is 33.

The square root of 11777820 is about 3431.8828651339. The cubic root of 11777820 is about 227.5210784318.

The spelling of 11777820 in words is "eleven million, seven hundred seventy-seven thousand, eight hundred twenty".