128699648 has 72 divisors (see below), whose sum is σ = 320335680. Its totient is φ = 50135040.

The previous prime is 128699609. The next prime is 128699671. The reversal of 128699648 is 846996821.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 128699648.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16448 + ... + 22976.

Almost surely, 2^128699648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128699648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160167840).

128699648 is an abundant number, since it is smaller than the sum of its proper divisors (191636032).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128699648 is an equidigital number, since it uses as much as digits as its factorization.

128699648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6563 (or 6549 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 53.

The square root of 128699648 is about 11344.5867267168. The cubic root of 128699648 is about 504.8849824652.

The spelling of 128699648 in words is "one hundred twenty-eight million, six hundred ninety-nine thousand, six hundred forty-eight".