128964815 has 12 divisors (see below), whose sum is σ = 180024696. Its totient is φ = 88432848.

The previous prime is 128964763. The next prime is 128964833. The reversal of 128964815 is 518469821.

It is not a de Polignac number, because 128964815 - 2⁶ = 128964751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 262949 + ... + 263438.

It is an arithmetic number, because the mean of its divisors is an integer number (15002058).

Almost surely, 2^128964815 is an apocalyptic number.

128964815 is a deficient number, since it is larger than the sum of its proper divisors (51059881).

128964815 is an equidigital number, since it uses as much as digits as its factorization.

128964815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526406 (or 526399 counting only the distinct ones).

The product of its digits is 138240, while the sum is 44.

The square root of 128964815 is about 11356.2676527106. The cubic root of 128964815 is about 505.2314920771.

The spelling of 128964815 in words is "one hundred twenty-eight million, nine hundred sixty-four thousand, eight hundred fifteen".