138890127650 has 24 divisors (see below), whose sum is σ = 258428922660. Its totient is φ = 55535989760.

The previous prime is 138890127643. The next prime is 138890127683. The reversal of 138890127650 is 56721098831.

It can be written as a sum of positive squares in 6 ways, for example, as 75515589601 + 63374538049 = 274801^2 + 251743^2 .

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 361295 + ... + 638994.

Almost surely, 2^138890127650 is an apocalyptic number.

138890127650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138890127650 is a deficient number, since it is larger than the sum of its proper divisors (119538795010).

138890127650 is a wasteful number, since it uses less digits than its factorization.

138890127650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1003078 (or 1003073 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 50.

The spelling of 138890127650 in words is "one hundred thirty-eight billion, eight hundred ninety million, one hundred twenty-seven thousand, six hundred fifty".