128648736 has 60 divisors (see below), whose sum is σ = 378359982. Its totient is φ = 42882048.

The previous prime is 128648719. The next prime is 128648747. The reversal of 128648736 is 637846821.

It can be written as a sum of positive squares in only one way, i.e., 120560400 + 8088336 = 10980^2 + 2844^2 .

It is a junction number, because it is equal to n+sod(n) for n = 128648691 and 128648700.

It is a congruent number.

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 9 ways as a sum of consecutive naturals, for example, 22225 + ... + 27408.

Almost surely, 2^128648736 is an apocalyptic number.

128648736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

128648736 is an abundant number, since it is smaller than the sum of its proper divisors (249711246).

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

128648736 is an equidigital number, since it uses as much as digits as its factorization.

128648736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49655 (or 49638 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 128648736 is about 11342.3426151743. The cubic root of 128648736 is about 504.8183982518.

The spelling of 128648736 in words is "one hundred twenty-eight million, six hundred forty-eight thousand, seven hundred thirty-six".