128564945 has 16 divisors (see below), whose sum is σ = 156230400. Its totient is φ = 101559744.

The previous prime is 128564941. The next prime is 128564957. The reversal of 128564945 is 549465821.

It is a cyclic number.

It is not a de Polignac number, because 128564945 - 2² = 128564941 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 128564896 and 128564905.

It is not an unprimeable number, because it can be changed into a prime (128564941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155804 + ... + 156626.

It is an arithmetic number, because the mean of its divisors is an integer number (9764400).

Almost surely, 2^128564945 is an apocalyptic number.

It is an amenable number.

128564945 is a deficient number, since it is larger than the sum of its proper divisors (27665455).

128564945 is a wasteful number, since it uses less digits than its factorization.

128564945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1184.

The product of its digits is 345600, while the sum is 44.

The square root of 128564945 is about 11338.6482880456. The cubic root of 128564945 is about 504.7087756561.

The spelling of 128564945 in words is "one hundred twenty-eight million, five hundred sixty-four thousand, nine hundred forty-five".