2775220 has 48 divisors (see below), whose sum is σ = 6830208. Its totient is φ = 927360.

The previous prime is 2775193. The next prime is 2775221. The reversal of 2775220 is 225772.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2775221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5790 + ... + 6250.

It is an arithmetic number, because the mean of its divisors is an integer number (142296).

2^2775220 is an apocalyptic number.

2775220 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 2775220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3415104).

2775220 is an abundant number, since it is smaller than the sum of its proper divisors (4054988).

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

2775220 is a wasteful number, since it uses less digits than its factorization.

2775220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520 (or 518 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 25.

The square root of 2775220 is about 1665.8991566118. The cubic root of 2775220 is about 140.5289513673.

It can be divided in two parts, 27752 and 20, that added together give a palindrome (27772).

The spelling of 2775220 in words is "two million, seven hundred seventy-five thousand, two hundred twenty".