2777777765 has 16 divisors (see below), whose sum is σ = 3810440448. Its totient is φ = 1904303616.

The previous prime is 2777777759. The next prime is 2777777777. The reversal of 2777777765 is 5677777772.

It is a cyclic number.

It is not a de Polignac number, because 2777777765 - 2¹⁰ = 2777776741 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2777777698 and 2777777707.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207464 + ... + 220446.

It is an arithmetic number, because the mean of its divisors is an integer number (238152528).

Almost surely, 2^2777777765 is an apocalyptic number.

It is an amenable number.

2777777765 is a deficient number, since it is larger than the sum of its proper divisors (1032662683).

2777777765 is a wasteful number, since it uses less digits than its factorization.

2777777765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19108.

The product of its digits is 49412580, while the sum is 62.

The square root of 2777777765 is about 52704.6275482523. The cubic root of 2777777765 is about 1405.7211066808.

The spelling of 2777777765 in words is "two billion, seven hundred seventy-seven million, seven hundred seventy-seven thousand, seven hundred sixty-five".