128562828778 has 8 divisors (see below), whose sum is σ = 192846108420. Its totient is φ = 64280792640.

The previous prime is 128562828769. The next prime is 128562828781. The reversal of 128562828778 is 877828265821.

It can be written as a sum of positive squares in 2 ways, for example, as 127947143809 + 615684969 = 357697^2 + 24813^2 .

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 16578 + ... + 507346.

Almost surely, 2^128562828778 is an apocalyptic number.

128562828778 is a deficient number, since it is larger than the sum of its proper divisors (64283279642).

128562828778 is a wasteful number, since it uses less digits than its factorization.

128562828778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621752.

The product of its digits is 48168960, while the sum is 64.

The spelling of 128562828778 in words is "one hundred twenty-eight billion, five hundred sixty-two million, eight hundred twenty-eight thousand, seven hundred seventy-eight".