138878764420 has 48 divisors (see below), whose sum is σ = 318989518848. Its totient is φ = 50369480960.

The previous prime is 138878764351. The next prime is 138878764429. The reversal of 138878764420 is 24467878831.

It is a super-2 number, since 2×138878764420² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138878764429) 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, 739849 + ... + 908368.

It is an arithmetic number, because the mean of its divisors is an integer number (6645614976).

Almost surely, 2^138878764420 is an apocalyptic number.

138878764420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138878764420 is an abundant number, since it is smaller than the sum of its proper divisors (180110754428).

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

138878764420 is a wasteful number, since it uses less digits than its factorization.

138878764420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1648620 (or 1648618 counting only the distinct ones).

The product of its (nonzero) digits is 14450688, while the sum is 58.

The spelling of 138878764420 in words is "one hundred thirty-eight billion, eight hundred seventy-eight million, seven hundred sixty-four thousand, four hundred twenty".