135687281563278 has 48 divisors (see below), whose sum is σ = 305031033914880. Its totient is φ = 45206331029496.

The previous prime is 135687281563277. The next prime is 135687281563289. The reversal of 135687281563278 is 872365182786531.

It is a happy number.

135687281563278 is a `hidden beast` number, since 1 + 3 + 56 + 8 + 7 + 2 + 8 + 1 + 563 + 2 + 7 + 8 = 666.

It is a super-2 number, since 2×135687281563278² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135687281563277) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69288958 + ... + 71220321.

It is an arithmetic number, because the mean of its divisors is an integer number (6354813206560).

Almost surely, 2^{135687281563278} is an apocalyptic number.

135687281563278 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

135687281563278 is an abundant number, since it is smaller than the sum of its proper divisors (169343752351602).

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

135687281563278 is a wasteful number, since it uses less digits than its factorization.

135687281563278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140511283 (or 140511271 counting only the distinct ones).

The product of its digits is 812851200, while the sum is 72.

The spelling of 135687281563278 in words is "one hundred thirty-five trillion, six hundred eighty-seven billion, two hundred eighty-one million, five hundred sixty-three thousand, two hundred seventy-eight".