2775880 has 32 divisors (see below), whose sum is σ = 6463800. Its totient is φ = 1071616.

The previous prime is 2775863. The next prime is 2775889. The reversal of 2775880 is 885772.

It can be written as a sum of positive squares in 4 ways, for example, as 1425636 + 1350244 = 1194^2 + 1162^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2775889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37 + ... + 2356.

2^2775880 is an apocalyptic number.

2775880 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 2775880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3231900).

2775880 is an abundant number, since it is smaller than the sum of its proper divisors (3687920).

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

2775880 is a wasteful number, since it uses less digits than its factorization.

2775880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2433 (or 2429 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 37.

The square root of 2775880 is about 1666.0972360580. The cubic root of 2775880 is about 140.5400906351.

It can be divided in two parts, 2775 and 880, that added together give a triangular number (3655 = T₈₅).

The spelling of 2775880 in words is "two million, seven hundred seventy-five thousand, eight hundred eighty".