2766780 has 72 divisors (see below), whose sum is σ = 8845200. Its totient is φ = 698112.

The previous prime is 2766779. The next prime is 2766787. The reversal of 2766780 is 876672.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2766787) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 3016 + ... + 3824.

It is an arithmetic number, because the mean of its divisors is an integer number (122850).

2^2766780 is an apocalyptic number.

2766780 is a gapful number since it is divisible by the number (20) 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 2766780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4422600).

2766780 is an abundant number, since it is smaller than the sum of its proper divisors (6078420).

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

2766780 is a wasteful number, since it uses less digits than its factorization.

2766780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843 (or 838 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 2766780 is about 1663.3640611724. The cubic root of 2766780 is about 140.3863478093.

It can be divided in two parts, 276 and 6780, that added together give a square (7056 = 84²).

The spelling of 2766780 in words is "two million, seven hundred sixty-six thousand, seven hundred eighty".