128804815 has 8 divisors (see below), whose sum is σ = 154971648. Its totient is φ = 102773280.

The previous prime is 128804813. The next prime is 128804867. The reversal of 128804815 is 518408821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128804815 - 2¹ = 128804813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128804813) 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 7 ways as a sum of consecutive naturals, for example, 31716 + ... + 35545.

It is an arithmetic number, because the mean of its divisors is an integer number (19371456).

Almost surely, 2^128804815 is an apocalyptic number.

128804815 is a deficient number, since it is larger than the sum of its proper divisors (26166833).

128804815 is an equidigital number, since it uses as much as digits as its factorization.

128804815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67649.

The product of its (nonzero) digits is 20480, while the sum is 37.

The square root of 128804815 is about 11349.2208983701. The cubic root of 128804815 is about 505.0224673859.

The spelling of 128804815 in words is "one hundred twenty-eight million, eight hundred four thousand, eight hundred fifteen".