128318978 has 16 divisors (see below), whose sum is σ = 201225600. Its totient is φ = 61254336.

The previous prime is 128318969. The next prime is 128319007. The reversal of 128318978 is 879813821.

It is a super-2 number, since 2×128318978² = 32931520229928968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25226 + ... + 29882.

It is an arithmetic number, because the mean of its divisors is an integer number (12576600).

Almost surely, 2^128318978 is an apocalyptic number.

128318978 is a deficient number, since it is larger than the sum of its proper divisors (72906622).

128318978 is a wasteful number, since it uses less digits than its factorization.

128318978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5281.

The product of its digits is 193536, while the sum is 47.

The square root of 128318978 is about 11327.7966966220. The cubic root of 128318978 is about 504.3867050848.

The spelling of 128318978 in words is "one hundred twenty-eight million, three hundred eighteen thousand, nine hundred seventy-eight".