128164978 has 8 divisors (see below), whose sum is σ = 198876780. Its totient is φ = 61872720.

The previous prime is 128164973. The next prime is 128164991. The reversal of 128164978 is 879461821.

It can be written as a sum of positive squares in 2 ways, for example, as 119968209 + 8196769 = 10953^2 + 2863^2 .

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

It is not an unprimeable number, because it can be changed into a prime (128164973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1104813 + ... + 1104928.

Almost surely, 2^128164978 is an apocalyptic number.

128164978 is a deficient number, since it is larger than the sum of its proper divisors (70711802).

128164978 is a wasteful number, since it uses less digits than its factorization.

128164978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2209772.

The product of its digits is 193536, while the sum is 46.

The square root of 128164978 is about 11320.9972175599. The cubic root of 128164978 is about 504.1848470582.

The spelling of 128164978 in words is "one hundred twenty-eight million, one hundred sixty-four thousand, nine hundred seventy-eight".