2775565 has 8 divisors (see below), whose sum is σ = 3586968. Its totient is φ = 2049600.

The previous prime is 2775559. The next prime is 2775569. The reversal of 2775565 is 5655772.

It can be written as a sum of positive squares in 4 ways, for example, as 407044 + 2368521 = 638^2 + 1539^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2775565 - 2²¹ = 678413 is a prime.

It is a super-2 number, since 2×2775565² = 15407522138450, which contains 22 as substring.

It is a Duffinian number.

2775565 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2775569) 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, 21286 + ... + 21415.

It is an arithmetic number, because the mean of its divisors is an integer number (448371).

2^2775565 is an apocalyptic number.

It is an amenable number.

2775565 is a deficient number, since it is larger than the sum of its proper divisors (811403).

2775565 is a wasteful number, since it uses less digits than its factorization.

2775565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42719.

The product of its digits is 73500, while the sum is 37.

The square root of 2775565 is about 1666.0027010782. The cubic root of 2775565 is about 140.5347743866.

The spelling of 2775565 in words is "two million, seven hundred seventy-five thousand, five hundred sixty-five".