2770561 has 4 divisors (see below), whose sum is σ = 2916400. Its totient is φ = 2624724.

The previous prime is 2770553. The next prime is 2770571. The reversal of 2770561 is 1650772.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2770561 - 2³ = 2770553 is a prime.

It is the 1665-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2770571) by changing a digit.

It is a nontrivial repunit in base 1664.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72891 + ... + 72928.

It is an arithmetic number, because the mean of its divisors is an integer number (729100).

2^2770561 is an apocalyptic number.

It is an amenable number.

2770561 is a deficient number, since it is larger than the sum of its proper divisors (145839).

2770561 is a wasteful number, since it uses less digits than its factorization.

2770561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145838.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 2770561 is about 1664.5002252929. The cubic root of 2770561 is about 140.4502679827.

The spelling of 2770561 in words is "two million, seven hundred seventy thousand, five hundred sixty-one".