128560905 has 32 divisors (see below), whose sum is σ = 249333120. Its totient is φ = 62331840.

The previous prime is 128560877. The next prime is 128560921. The reversal of 128560905 is 509065821.

It is a happy number.

128560905 is a `hidden beast` number, since 1 + 2 + 8 + 560 + 90 + 5 = 666.

It is not a de Polignac number, because 128560905 - 2¹² = 128556809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128560905.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41802 + ... + 44771.

It is an arithmetic number, because the mean of its divisors is an integer number (7791660).

Almost surely, 2^128560905 is an apocalyptic number.

128560905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128560905 is a deficient number, since it is larger than the sum of its proper divisors (120772215).

128560905 is a wasteful number, since it uses less digits than its factorization.

128560905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86598 (or 86592 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 128560905 is about 11338.4701348992. The cubic root of 128560905 is about 504.7034889770.

The spelling of 128560905 in words is "one hundred twenty-eight million, five hundred sixty thousand, nine hundred five".