2678647138 has 8 divisors (see below), whose sum is σ = 4019659740. Its totient is φ = 1338760560.

The previous prime is 2678647133. The next prime is 2678647157. The reversal of 2678647138 is 8317468762.

It can be written as a sum of positive squares in 2 ways, for example, as 2243632689 + 435014449 = 47367^2 + 20857^2 .

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

It is not an unprimeable number, because it can be changed into a prime (2678647133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275533 + ... + 285088.

Almost surely, 2^2678647138 is an apocalyptic number.

2678647138 is a deficient number, since it is larger than the sum of its proper divisors (1341012602).

2678647138 is a wasteful number, since it uses less digits than its factorization.

2678647138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563012.

The product of its digits is 2709504, while the sum is 52.

The square root of 2678647138 is about 51755.6483680767. The cubic root of 2678647138 is about 1388.7961451795.

The spelling of 2678647138 in words is "two billion, six hundred seventy-eight million, six hundred forty-seven thousand, one hundred thirty-eight".