128631304 has 8 divisors (see below), whose sum is σ = 241183710. Its totient is φ = 64315648.

The previous prime is 128631301. The next prime is 128631319. The reversal of 128631304 is 403136821.

It can be written as a sum of positive squares in only one way, i.e., 120780100 + 7851204 = 10990^2 + 2802^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (128631301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8039449 + ... + 8039464.

Almost surely, 2^128631304 is an apocalyptic number.

It is an amenable number.

128631304 is a deficient number, since it is larger than the sum of its proper divisors (112552406).

128631304 is a wasteful number, since it uses less digits than its factorization.

128631304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16078919 (or 16078915 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 128631304 is about 11341.5741411852. The cubic root of 128631304 is about 504.7955961316.

The spelling of 128631304 in words is "one hundred twenty-eight million, six hundred thirty-one thousand, three hundred four".