2765564787 has 16 divisors (see below), whose sum is σ = 3815965440. Its totient is φ = 1779483552.

The previous prime is 2765564783. The next prime is 2765564843. The reversal of 2765564787 is 7874655672.

It is not a de Polignac number, because 2765564787 - 2² = 2765564783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2765564783) 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, 381208 + ... + 388394.

It is an arithmetic number, because the mean of its divisors is an integer number (238497840).

Almost surely, 2^2765564787 is an apocalyptic number.

2765564787 is a deficient number, since it is larger than the sum of its proper divisors (1050400653).

2765564787 is a wasteful number, since it uses less digits than its factorization.

2765564787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11642.

The product of its digits is 19756800, while the sum is 57.

The square root of 2765564787 is about 52588.6374324340. The cubic root of 2765564787 is about 1403.6579150709.

The spelling of 2765564787 in words is "two billion, seven hundred sixty-five million, five hundred sixty-four thousand, seven hundred eighty-seven".