138809706880 has 256 divisors, whose sum is σ = 370222594560. Its totient is φ = 49421352960.

The previous prime is 138809706877. The next prime is 138809706883. The reversal of 138809706880 is 88607908831.

It is an interprime number because it is at equal distance from previous prime (138809706877) and next prime (138809706883).

It is a super-2 number, since 2×138809706880² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138809706883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 86918242 + ... + 86919838.

It is an arithmetic number, because the mean of its divisors is an integer number (1446182010).

Almost surely, 2^138809706880 is an apocalyptic number.

138809706880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138809706880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185111297280).

138809706880 is an abundant number, since it is smaller than the sum of its proper divisors (231412887680).

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

138809706880 is a wasteful number, since it uses less digits than its factorization.

138809706880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1997 (or 1985 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 58.

The spelling of 138809706880 in words is "one hundred thirty-eight billion, eight hundred nine million, seven hundred six thousand, eight hundred eighty".