128908851 has 16 divisors (see below), whose sum is σ = 177715968. Its totient is φ = 83052000.

The previous prime is 128908849. The next prime is 128908861. The reversal of 128908851 is 158809821.

It is not a de Polignac number, because 128908851 - 2¹ = 128908849 is a prime.

It is a super-2 number, since 2×128908851² = 33234983732280402, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128908811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12916 + ... + 20606.

It is an arithmetic number, because the mean of its divisors is an integer number (11107248).

Almost surely, 2^128908851 is an apocalyptic number.

128908851 is a deficient number, since it is larger than the sum of its proper divisors (48807117).

128908851 is a wasteful number, since it uses less digits than its factorization.

128908851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7882.

The product of its (nonzero) digits is 46080, while the sum is 42.

The square root of 128908851 is about 11353.8033715579. The cubic root of 128908851 is about 505.1584001356.

The spelling of 128908851 in words is "one hundred twenty-eight million, nine hundred eight thousand, eight hundred fifty-one".