128236816 has 10 divisors (see below), whose sum is σ = 248458862. Its totient is φ = 64118400.

The previous prime is 128236789. The next prime is 128236841. The reversal of 128236816 is 618632821.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 92236816 + 36000000 = 9604^2 + 6000^2 .

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 as a sum of consecutive naturals, namely, 4007385 + ... + 4007416.

Almost surely, 2^128236816 is an apocalyptic number.

128236816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

128236816 is a deficient number, since it is larger than the sum of its proper divisors (120222046).

128236816 is an equidigital number, since it uses as much as digits as its factorization.

128236816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8014809 (or 8014803 counting only the distinct ones).

The product of its digits is 27648, while the sum is 37.

The square root of 128236816 is about 11324.1695501260. The cubic root of 128236816 is about 504.2790300052.

The spelling of 128236816 in words is "one hundred twenty-eight million, two hundred thirty-six thousand, eight hundred sixteen".