128932816 has 30 divisors (see below), whose sum is σ = 252383586. Its totient is φ = 63806400.

The previous prime is 128932807. The next prime is 128932849. The reversal of 128932816 is 618239821.

It can be written as a sum of positive squares in only one way, i.e., 71233600 + 57699216 = 8440^2 + 7596^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 610951 + ... + 611161.

Almost surely, 2^128932816 is an apocalyptic number.

128932816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

128932816 is a deficient number, since it is larger than the sum of its proper divisors (123450770).

128932816 is an equidigital number, since it uses as much as digits as its factorization.

128932816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611 (or 394 counting only the distinct ones).

The product of its digits is 41472, while the sum is 40.

The square root of 128932816 is about 11354.8586957302. The cubic root of 128932816 is about 505.1897022814.

The spelling of 128932816 in words is "one hundred twenty-eight million, nine hundred thirty-two thousand, eight hundred sixteen".