138498867828 has 36 divisors (see below), whose sum is σ = 359556373540. Its totient is φ = 44918551296.

The previous prime is 138498867811. The next prime is 138498867833. The reversal of 138498867828 is 828768894831.

138498867828 is a `hidden beast` number, since 1 + 38 + 498 + 86 + 7 + 8 + 28 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 110099203344 + 28399664484 = 331812^2 + 168522^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51987733 + ... + 51990396.

Almost surely, 2^138498867828 is an apocalyptic number.

138498867828 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

138498867828 is an abundant number, since it is smaller than the sum of its proper divisors (221057505712).

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

138498867828 is a wasteful number, since it uses less digits than its factorization.

138498867828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103978176 (or 103978171 counting only the distinct ones).

The product of its digits is 297271296, while the sum is 72.

The spelling of 138498867828 in words is "one hundred thirty-eight billion, four hundred ninety-eight million, eight hundred sixty-seven thousand, eight hundred twenty-eight".