128609739830 has 64 divisors (see below), whose sum is σ = 274464590400. Its totient is φ = 42773598720.

The previous prime is 128609739823. The next prime is 128609739847. The reversal of 128609739830 is 38937906821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 256685 + ... + 568424.

It is an arithmetic number, because the mean of its divisors is an integer number (4288509225).

Almost surely, 2^128609739830 is an apocalyptic number.

128609739830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128609739830 is an abundant number, since it is smaller than the sum of its proper divisors (145854850570).

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

128609739830 is a wasteful number, since it uses less digits than its factorization.

128609739830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825249.

The product of its (nonzero) digits is 3919104, while the sum is 56.

The spelling of 128609739830 in words is "one hundred twenty-eight billion, six hundred nine million, seven hundred thirty-nine thousand, eight hundred thirty".