138877621740 has 360 divisors, whose sum is σ = 515716278000. Its totient is φ = 31076939520.

The previous prime is 138877621721. The next prime is 138877621777. The reversal of 138877621740 is 47126778831.

138877621740 is a `hidden beast` number, since 1 + 3 + 8 + 8 + 7 + 7 + 621 + 7 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 2521011 + ... + 2575509.

Almost surely, 2^138877621740 is an apocalyptic number.

138877621740 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 138877621740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257858139000).

138877621740 is an abundant number, since it is smaller than the sum of its proper divisors (376838656260).

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

138877621740 is a wasteful number, since it uses less digits than its factorization.

138877621740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54555 (or 54533 counting only the distinct ones).

The product of its (nonzero) digits is 3161088, while the sum is 54.

The spelling of 138877621740 in words is "one hundred thirty-eight billion, eight hundred seventy-seven million, six hundred twenty-one thousand, seven hundred forty".