138687271604 has 24 divisors (see below), whose sum is σ = 277599936768. Its totient is φ = 59389103520.

The previous prime is 138687271601. The next prime is 138687271609. The reversal of 138687271604 is 406172786831.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138687271601) 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 7 ways as a sum of consecutive naturals, for example, 1977359 + ... + 2046294.

It is an arithmetic number, because the mean of its divisors is an integer number (11566664032).

Almost surely, 2^138687271604 is an apocalyptic number.

138687271604 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

138687271604 is an abundant number, since it is smaller than the sum of its proper divisors (138912665164).

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

138687271604 is a wasteful number, since it uses less digits than its factorization.

138687271604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4024895 (or 4024893 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 53.

The spelling of 138687271604 in words is "one hundred thirty-eight billion, six hundred eighty-seven million, two hundred seventy-one thousand, six hundred four".