26894778138 has 40 divisors (see below), whose sum is σ = 60885541332. Its totient is φ = 8872498944.

The previous prime is 26894778137. The next prime is 26894778143. The reversal of 26894778138 is 83187749862.

26894778138 is a `hidden beast` number, since 2 + 6 + 89 + 477 + 81 + 3 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 25915526289 + 979251849 = 160983^2 + 31293^2 .

It is not an unprimeable number, because it can be changed into a prime (26894778137) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 840045 + ... + 871472.

Almost surely, 2^26894778138 is an apocalyptic number.

26894778138 is an abundant number, since it is smaller than the sum of its proper divisors (33990763194).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26894778138 is a wasteful number, since it uses less digits than its factorization.

26894778138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1711628 (or 1711619 counting only the distinct ones).

The product of its digits is 32514048, while the sum is 63.

The spelling of 26894778138 in words is "twenty-six billion, eight hundred ninety-four million, seven hundred seventy-eight thousand, one hundred thirty-eight".