128376978 has 16 divisors (see below), whose sum is σ = 259402080. Its totient is φ = 42350976.

The previous prime is 128376953. The next prime is 128377003. The reversal of 128376978 is 879673821.

It is an interprime number because it is at equal distance from previous prime (128376953) and next prime (128377003).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 128376978.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109708 + ... + 110871.

It is an arithmetic number, because the mean of its divisors is an integer number (16212630).

Almost surely, 2^128376978 is an apocalyptic number.

128376978 is an abundant number, since it is smaller than the sum of its proper divisors (131025102).

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

128376978 is a wasteful number, since it uses less digits than its factorization.

128376978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220681.

The product of its digits is 1016064, while the sum is 51.

The square root of 128376978 is about 11330.3564815940. The cubic root of 128376978 is about 504.4626876682.

The spelling of 128376978 in words is "one hundred twenty-eight million, three hundred seventy-six thousand, nine hundred seventy-eight".