2778765145 has 8 divisors (see below), whose sum is σ = 3591019656. Its totient is φ = 2052011136.

The previous prime is 2778765139. The next prime is 2778765211. The reversal of 2778765145 is 5415678772.

It can be written as a sum of positive squares in 4 ways, for example, as 526977936 + 2251787209 = 22956^2 + 47453^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2778765145 - 2¹⁵ = 2778732377 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2778765092 and 2778765101.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21375052 + ... + 21375181.

It is an arithmetic number, because the mean of its divisors is an integer number (448877457).

Almost surely, 2^2778765145 is an apocalyptic number.

It is an amenable number.

2778765145 is a deficient number, since it is larger than the sum of its proper divisors (812254511).

2778765145 is a wasteful number, since it uses less digits than its factorization.

2778765145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42750251.

The product of its digits is 3292800, while the sum is 52.

The square root of 2778765145 is about 52713.9938251694. The cubic root of 2778765145 is about 1405.8876446595.

The spelling of 2778765145 in words is "two billion, seven hundred seventy-eight million, seven hundred sixty-five thousand, one hundred forty-five".