128633888 has 12 divisors (see below), whose sum is σ = 253248030. Its totient is φ = 64316928.

The previous prime is 128633887. The next prime is 128633891. The reversal of 128633888 is 888336821.

It can be written as a sum of positive squares in only one way, i.e., 110418064 + 18215824 = 10508^2 + 4268^2 .

It is not an unprimeable number, because it can be changed into a prime (128633881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2009873 + ... + 2009936.

Almost surely, 2^128633888 is an apocalyptic number.

It is an amenable number.

128633888 is a deficient number, since it is larger than the sum of its proper divisors (124614142).

128633888 is an equidigital number, since it uses as much as digits as its factorization.

128633888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4019819 (or 4019811 counting only the distinct ones).

The product of its digits is 442368, while the sum is 47.

The square root of 128633888 is about 11341.6880577805. The cubic root of 128633888 is about 504.7989762914.

The spelling of 128633888 in words is "one hundred twenty-eight million, six hundred thirty-three thousand, eight hundred eighty-eight".