2775780 has 72 divisors (see below), whose sum is σ = 9627072. Its totient is φ = 634176.

The previous prime is 2775761. The next prime is 2775781. The reversal of 2775780 is 875772.

2775780 is digitally balanced in base 2, because in such base 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 not an unprimeable number, because it can be changed into a prime (2775781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 159 + ... + 2361.

2^2775780 is an apocalyptic number.

2775780 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 2775780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4813536).

2775780 is an abundant number, since it is smaller than the sum of its proper divisors (6851292).

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

2775780 is a wasteful number, since it uses less digits than its factorization.

2775780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2225 (or 2220 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 36.

The square root of 2775780 is about 1666.0672255344. The cubic root of 2775780 is about 140.5384029807.

Subtracting from 2775780 its product of nonzero digits (27440), we obtain a triangular number (2748340 = T₂₃₄₄).

The spelling of 2775780 in words is "two million, seven hundred seventy-five thousand, seven hundred eighty".