138225868280 has 64 divisors (see below), whose sum is σ = 325192320000. Its totient is φ = 52778535040.

The previous prime is 138225868271. The next prime is 138225868283. The reversal of 138225868280 is 82868522831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138225868283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 298721 + ... + 604719.

It is an arithmetic number, because the mean of its divisors is an integer number (5081130000).

Almost surely, 2^138225868280 is an apocalyptic number.

138225868280 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 138225868280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162596160000).

138225868280 is an abundant number, since it is smaller than the sum of its proper divisors (186966451720).

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

138225868280 is a wasteful number, since it uses less digits than its factorization.

138225868280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306524 (or 306520 counting only the distinct ones).

The product of its (nonzero) digits is 2949120, while the sum is 53.

The spelling of 138225868280 in words is "one hundred thirty-eight billion, two hundred twenty-five million, eight hundred sixty-eight thousand, two hundred eighty".