128138004 has 48 divisors (see below), whose sum is σ = 342935040. Its totient is φ = 41333760.

The previous prime is 128137981. The next prime is 128138009. The reversal of 128138004 is 400831821.

128138004 is a `hidden beast` number, since 1 + 281 + 380 + 0 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128138009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15789 + ... + 22484.

It is an arithmetic number, because the mean of its divisors is an integer number (7144480).

Almost surely, 2^128138004 is an apocalyptic number.

It is an amenable number.

128138004 is an abundant number, since it is smaller than the sum of its proper divisors (214797036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128138004 is a wasteful number, since it uses less digits than its factorization.

128138004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38317 (or 38309 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 128138004 is about 11319.8058287234. The cubic root of 128138004 is about 504.1494738060.

Adding to 128138004 its reverse (400831821), we get a palindrome (528969825).

The spelling of 128138004 in words is "one hundred twenty-eight million, one hundred thirty-eight thousand, four".