138950630640 has 120 divisors (see below), whose sum is σ = 467664741648. Its totient is φ = 36972334080.

The previous prime is 138950630639. The next prime is 138950630657. The reversal of 138950630640 is 46036059831.

138950630640 is a `hidden beast` number, since 1 + 3 + 8 + 9 + 5 + 0 + 630 + 6 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 117895 + ... + 540185.

Almost surely, 2^138950630640 is an apocalyptic number.

138950630640 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 138950630640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (233832370824).

138950630640 is an abundant number, since it is smaller than the sum of its proper divisors (328714111008).

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

138950630640 is a wasteful number, since it uses less digits than its factorization.

138950630640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422767 (or 422758 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 138950630640 in words is "one hundred thirty-eight billion, nine hundred fifty million, six hundred thirty thousand, six hundred forty".