128816465 has 8 divisors (see below), whose sum is σ = 158350248. Its totient is φ = 100539520.

The previous prime is 128816449. The next prime is 128816477. The reversal of 128816465 is 564618821.

It can be written as a sum of positive squares in 4 ways, for example, as 4293184 + 124523281 = 2072^2 + 11159^2 .

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

It is not a de Polignac number, because 128816465 - 2⁴ = 128816449 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 313982 + ... + 314391.

It is an arithmetic number, because the mean of its divisors is an integer number (19793781).

Almost surely, 2^128816465 is an apocalyptic number.

It is an amenable number.

128816465 is a deficient number, since it is larger than the sum of its proper divisors (29533783).

128816465 is an equidigital number, since it uses as much as digits as its factorization.

128816465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628419.

The product of its digits is 92160, while the sum is 41.

The square root of 128816465 is about 11349.7341378554. The cubic root of 128816465 is about 505.0376928373.

The spelling of 128816465 in words is "one hundred twenty-eight million, eight hundred sixteen thousand, four hundred sixty-five".