128209936719 has 24 divisors (see below), whose sum is σ = 173781227520. Its totient is φ = 84078297792.

The previous prime is 128209936697. The next prime is 128209936753. The reversal of 128209936719 is 917639902821.

It is not a de Polignac number, because 128209936719 - 2¹² = 128209932623 is a prime.

It is a super-2 number, since 2×128209936719² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128209936819) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6112552 + ... + 6133490.

It is an arithmetic number, because the mean of its divisors is an integer number (7240884480).

Almost surely, 2^128209936719 is an apocalyptic number.

128209936719 is a deficient number, since it is larger than the sum of its proper divisors (45571290801).

128209936719 is an equidigital number, since it uses as much as digits as its factorization.

128209936719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21471 (or 21398 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 57.

The spelling of 128209936719 in words is "one hundred twenty-eight billion, two hundred nine million, nine hundred thirty-six thousand, seven hundred nineteen".