128500004 has 6 divisors (see below), whose sum is σ = 224875014. Its totient is φ = 64250000.

The previous prime is 128500003. The next prime is 128500007. The reversal of 128500004 is 400005821.

It can be written as a sum of positive squares in only one way, i.e., 128142400 + 357604 = 11320^2 + 598^2 .

It is not an unprimeable number, because it can be changed into a prime (128500003) 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, 16062497 + ... + 16062504.

It is an arithmetic number, because the mean of its divisors is an integer number (37479169).

Almost surely, 2^128500004 is an apocalyptic number.

It is an amenable number.

128500004 is a deficient number, since it is larger than the sum of its proper divisors (96375010).

128500004 is a wasteful number, since it uses less digits than its factorization.

128500004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32125005 (or 32125003 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 128500004 is about 11335.7842251871. The cubic root of 128500004 is about 504.6237814849.

Adding to 128500004 its reverse (400005821), we get a palindrome (528505825).

The spelling of 128500004 in words is "one hundred twenty-eight million, five hundred thousand, four".