128355904 has 28 divisors (see below), whose sum is σ = 255158748. Its totient is φ = 64064000.

The previous prime is 128355883. The next prime is 128355907. The reversal of 128355904 is 409553821.

It can be written as a sum of positive squares in 2 ways, for example, as 92929600 + 35426304 = 9640^2 + 5952^2 .

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (128355907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43434 + ... + 46294.

Almost surely, 2^128355904 is an apocalyptic number.

It is an amenable number.

128355904 is a deficient number, since it is larger than the sum of its proper divisors (126802844).

128355904 is an equidigital number, since it uses as much as digits as its factorization.

128355904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3574 (or 3564 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 128355904 is about 11329.4264638595. The cubic root of 128355904 is about 504.4350824370.

The spelling of 128355904 in words is "one hundred twenty-eight million, three hundred fifty-five thousand, nine hundred four".