128563405 has 16 divisors (see below), whose sum is σ = 164016000. Its totient is φ = 96465600.

The previous prime is 128563397. The next prime is 128563411. The reversal of 128563405 is 504365821.

It is not a de Polignac number, because 128563405 - 2³ = 128563397 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2896 + ... + 16294.

It is an arithmetic number, because the mean of its divisors is an integer number (10251000).

Almost surely, 2^128563405 is an apocalyptic number.

It is an amenable number.

128563405 is a deficient number, since it is larger than the sum of its proper divisors (35452595).

128563405 is a wasteful number, since it uses less digits than its factorization.

128563405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13524.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 128563405 is about 11338.5803785130. The cubic root of 128563405 is about 504.7067604499.

It can be divided in two parts, 12856 and 3405, that added together give a palindrome (16261).

The spelling of 128563405 in words is "one hundred twenty-eight million, five hundred sixty-three thousand, four hundred five".