128616978 has 32 divisors (see below), whose sum is σ = 296110080. Its totient is φ = 36481680.

The previous prime is 128616973. The next prime is 128617031. The reversal of 128616978 is 879616821.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128616973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5178 + ... + 16853.

It is an arithmetic number, because the mean of its divisors is an integer number (9253440).

Almost surely, 2^128616978 is an apocalyptic number.

128616978 is an abundant number, since it is smaller than the sum of its proper divisors (167493102).

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

128616978 is a wasteful number, since it uses less digits than its factorization.

128616978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22182.

The product of its digits is 290304, while the sum is 48.

The square root of 128616978 is about 11340.9425534212. The cubic root of 128616978 is about 504.7768553068.

The spelling of 128616978 in words is "one hundred twenty-eight million, six hundred sixteen thousand, nine hundred seventy-eight".