2605305765 has 16 divisors (see below), whose sum is σ = 4172138496. Its totient is φ = 1388280000.

The previous prime is 2605305733. The next prime is 2605305767. The reversal of 2605305765 is 5675035062.

It is not a de Polignac number, because 2605305765 - 2⁵ = 2605305733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2605305767) 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, 58186 + ... + 92715.

It is an arithmetic number, because the mean of its divisors is an integer number (260758656).

Almost surely, 2^2605305765 is an apocalyptic number.

It is an amenable number.

2605305765 is a deficient number, since it is larger than the sum of its proper divisors (1566832731).

2605305765 is a wasteful number, since it uses less digits than its factorization.

2605305765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152060.

The product of its (nonzero) digits is 189000, while the sum is 39.

The square root of 2605305765 is about 51042.1959265077. The cubic root of 2605305765 is about 1376.0035895224.

The spelling of 2605305765 in words is "two billion, six hundred five million, three hundred five thousand, seven hundred sixty-five".