138778990088 has 16 divisors (see below), whose sum is σ = 263775136380. Its totient is φ = 68438953728.

The previous prime is 138778990081. The next prime is 138778990109. The reversal of 138778990088 is 880099877831.

It can be written as a sum of positive squares in 2 ways, for example, as 136735769284 + 2043220804 = 369778^2 + 45202^2 .

It is not an unprimeable number, because it can be changed into a prime (138778990081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118817045 + ... + 118818212.

Almost surely, 2^138778990088 is an apocalyptic number.

It is an amenable number.

138778990088 is a deficient number, since it is larger than the sum of its proper divisors (124996146292).

138778990088 is a wasteful number, since it uses less digits than its factorization.

138778990088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237635336 (or 237635332 counting only the distinct ones).

The product of its (nonzero) digits is 48771072, while the sum is 68.

The spelling of 138778990088 in words is "one hundred thirty-eight billion, seven hundred seventy-eight million, nine hundred ninety thousand, eighty-eight".