128488465 has 64 divisors (see below), whose sum is σ = 200309760. Its totient is φ = 77045760.

The previous prime is 128488453. The next prime is 128488471. The reversal of 128488465 is 564884821.

128488465 is a nontrivial binomial coefficient, being equal to C(16031, 2).

It is not a de Polignac number, because 128488465 - 2⁵ = 128488433 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 560971 + ... + 561199.

It is an arithmetic number, because the mean of its divisors is an integer number (3129840).

Almost surely, 2^128488465 is an apocalyptic number.

128488465 is the 16030-th triangular number.

128488465 is the 5344-th centered nonagonal number.

It is an amenable number.

128488465 is a deficient number, since it is larger than the sum of its proper divisors (71821295).

128488465 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (128488464) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (322).

128488465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322.

The product of its digits is 491520, while the sum is 46.

The square root of 128488465 is about 11335.2752502972. The cubic root of 128488465 is about 504.6086763541.

The spelling of 128488465 in words is "one hundred twenty-eight million, four hundred eighty-eight thousand, four hundred sixty-five".