128919732479 has 8 divisors (see below), whose sum is σ = 133425606048. Its totient is φ = 124478691840.

The previous prime is 128919732467. The next prime is 128919732521. The reversal of 128919732479 is 974237919821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128919732479 - 2⁸ = 128919732223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128919732079) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16204187 + ... + 16212140.

It is an arithmetic number, because the mean of its divisors is an integer number (16678200756).

Almost surely, 2^128919732479 is an apocalyptic number.

128919732479 is a deficient number, since it is larger than the sum of its proper divisors (4505873569).

128919732479 is an equidigital number, since it uses as much as digits as its factorization.

128919732479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32416465.

The product of its digits is 13716864, while the sum is 62.

The spelling of 128919732479 in words is "one hundred twenty-eight billion, nine hundred nineteen million, seven hundred thirty-two thousand, four hundred seventy-nine".