408128128 has 16 divisors (see below), whose sum is σ = 813068010. Its totient is φ = 204064000.

The previous prime is 408128117. The next prime is 408128191. The reversal of 408128128 is 821821804.

It can be written as a sum of positive squares in only one way, i.e., 282508864 + 125619264 = 16808^2 + 11208^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a junction number, because it is equal to n+sod(n) for n = 408128093 and 408128102.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1594123 + ... + 1594378.

Almost surely, 2^408128128 is an apocalyptic number.

It is an amenable number.

408128128 is a deficient number, since it is larger than the sum of its proper divisors (404939882).

408128128 is an equidigital number, since it uses as much as digits as its factorization.

408128128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3188515 (or 3188503 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 34.

The square root of 408128128 is about 20202.1812683680. The cubic root of 408128128 is about 741.7635852191.

The spelling of 408128128 in words is "four hundred eight million, one hundred twenty-eight thousand, one hundred twenty-eight".