2765661 has 4 divisors (see below), whose sum is σ = 3687552. Its totient is φ = 1843772.

The previous prime is 2765641. The next prime is 2765671. The reversal of 2765661 is 1665672.

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 2765661 - 2⁶ = 2765597 is a prime.

It is a D-number.

2765661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2765641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 460941 + ... + 460946.

It is an arithmetic number, because the mean of its divisors is an integer number (921888).

2^2765661 is an apocalyptic number.

It is an amenable number.

2765661 is a deficient number, since it is larger than the sum of its proper divisors (921891).

2765661 is an equidigital number, since it uses as much as digits as its factorization.

2765661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921890.

The product of its digits is 15120, while the sum is 33.

The square root of 2765661 is about 1663.0276606238. The cubic root of 2765661 is about 140.3674192466.

The spelling of 2765661 in words is "two million, seven hundred sixty-five thousand, six hundred sixty-one".