128475864 has 72 divisors (see below), whose sum is σ = 382489380. Its totient is φ = 38929440.

The previous prime is 128475857. The next prime is 128475881. The reversal of 128475864 is 468574821.

128475864 is a `hidden beast` number, since 1 + 28 + 47 + 586 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

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 17 ways as a sum of consecutive naturals, for example, 1339 + ... + 16085.

Almost surely, 2^128475864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128475864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191244690).

128475864 is an abundant number, since it is smaller than the sum of its proper divisors (254013516).

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

128475864 is a wasteful number, since it uses less digits than its factorization.

128475864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14781 (or 14763 counting only the distinct ones).

The product of its digits is 430080, while the sum is 45.

The square root of 128475864 is about 11334.7194054374. The cubic root of 128475864 is about 504.5921799788.

The spelling of 128475864 in words is "one hundred twenty-eight million, four hundred seventy-five thousand, eight hundred sixty-four".