128829978377 has 8 divisors (see below), whose sum is σ = 131345555400. Its totient is φ = 126317543040.

The previous prime is 128829978349. The next prime is 128829978397. The reversal of 128829978377 is 773879928821.

It can be written as a sum of positive squares in 4 ways, for example, as 40123695481 + 88706282896 = 200309^2 + 297836^2 .

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 128829978377 - 2¹⁴ = 128829961993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128829978377.

It is not an unprimeable number, because it can be changed into a prime (128829978307) 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, 702524 + ... + 866717.

It is an arithmetic number, because the mean of its divisors is an integer number (16418194425).

Almost surely, 2^128829978377 is an apocalyptic number.

It is an amenable number.

128829978377 is a deficient number, since it is larger than the sum of its proper divisors (2515577023).

128829978377 is a wasteful number, since it uses less digits than its factorization.

128829978377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1570843.

The product of its digits is 170698752, while the sum is 71.

The spelling of 128829978377 in words is "one hundred twenty-eight billion, eight hundred twenty-nine million, nine hundred seventy-eight thousand, three hundred seventy-seven".