128196730638 has 12 divisors (see below), whose sum is σ = 277759583088. Its totient is φ = 42732243540.

The previous prime is 128196730633. The next prime is 128196730643. The reversal of 128196730638 is 836037691821.

It is an interprime number because it is at equal distance from previous prime (128196730633) and next prime (128196730643).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128196730633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3561020278 + ... + 3561020313.

It is an arithmetic number, because the mean of its divisors is an integer number (23146631924).

Almost surely, 2^128196730638 is an apocalyptic number.

128196730638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

128196730638 is an abundant number, since it is smaller than the sum of its proper divisors (149562852450).

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

128196730638 is a wasteful number, since it uses less digits than its factorization.

128196730638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7122040599 (or 7122040596 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The spelling of 128196730638 in words is "one hundred twenty-eight billion, one hundred ninety-six million, seven hundred thirty thousand, six hundred thirty-eight".