128008815 has 16 divisors (see below), whose sum is σ = 223433856. Its totient is φ = 62064800.

The previous prime is 128008801. The next prime is 128008843. The reversal of 128008815 is 518800821.

It is not a de Polignac number, because 128008815 - 2¹⁰ = 128007791 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

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, 387741 + ... + 388070.

It is an arithmetic number, because the mean of its divisors is an integer number (13964616).

Almost surely, 2^128008815 is an apocalyptic number.

128008815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128008815 is a deficient number, since it is larger than the sum of its proper divisors (95425041).

128008815 is a wasteful number, since it uses less digits than its factorization.

128008815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775830.

The product of its (nonzero) digits is 5120, while the sum is 33.

The square root of 128008815 is about 11314.0980639201. The cubic root of 128008815 is about 503.9799886549.

The spelling of 128008815 in words is "one hundred twenty-eight million, eight thousand, eight hundred fifteen".