2776681138 has 36 divisors (see below), whose sum is σ = 5325546366. Its totient is φ = 1081819200.

The previous prime is 2776681121. The next prime is 2776681139. The reversal of 2776681138 is 8311866772.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2512716129 + 263965009 = 50127^2 + 16247^2 .

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a junction number, because it is equal to n+sod(n) for n = 2776681091 and 2776681100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2776681139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 105223 + ... + 128938.

Almost surely, 2^2776681138 is an apocalyptic number.

2776681138 is a deficient number, since it is larger than the sum of its proper divisors (2548865228).

2776681138 is a wasteful number, since it uses less digits than its factorization.

2776681138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234199 (or 234181 counting only the distinct ones).

The product of its digits is 677376, while the sum is 49.

The square root of 2776681138 is about 52694.2230040448. The cubic root of 2776681138 is about 1405.5360961249.

The spelling of 2776681138 in words is "two billion, seven hundred seventy-six million, six hundred eighty-one thousand, one hundred thirty-eight".