2779685138 has 8 divisors (see below), whose sum is σ = 4185028620. Its totient is φ = 1384675600.

The previous prime is 2779685089. The next prime is 2779685141. The reversal of 2779685138 is 8315869772.

It can be written as a sum of positive squares in 2 ways, for example, as 1901570449 + 878114689 = 43607^2 + 29633^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2582813 + ... + 2583888.

Almost surely, 2^2779685138 is an apocalyptic number.

2779685138 is a deficient number, since it is larger than the sum of its proper divisors (1405343482).

2779685138 is a wasteful number, since it uses less digits than its factorization.

2779685138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5166972.

The product of its digits is 5080320, while the sum is 56.

The square root of 2779685138 is about 52722.7193722023. The cubic root of 2779685138 is about 1406.0427812053.

The spelling of 2779685138 in words is "two billion, seven hundred seventy-nine million, six hundred eighty-five thousand, one hundred thirty-eight".