128265478 has 8 divisors (see below), whose sum is σ = 209889000. Its totient is φ = 58302480.

The previous prime is 128265451. The next prime is 128265559. The reversal of 128265478 is 874562821.

It is a happy number.

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

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 2915103 + ... + 2915146.

It is an arithmetic number, because the mean of its divisors is an integer number (26236125).

Almost surely, 2^128265478 is an apocalyptic number.

128265478 is a deficient number, since it is larger than the sum of its proper divisors (81623522).

128265478 is a wasteful number, since it uses less digits than its factorization.

128265478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5830262.

The product of its digits is 215040, while the sum is 43.

The square root of 128265478 is about 11325.4350026831. The cubic root of 128265478 is about 504.3165973988.

The spelling of 128265478 in words is "one hundred twenty-eight million, two hundred sixty-five thousand, four hundred seventy-eight".