128521336 has 16 divisors (see below), whose sum is σ = 241230600. Its totient is φ = 64193184.

The previous prime is 128521307. The next prime is 128521357. The reversal of 128521336 is 633125821.

It is a junction number, because it is equal to n+sod(n) for n = 128521298 and 128521307.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175 + ... + 16033.

Almost surely, 2^128521336 is an apocalyptic number.

It is an amenable number.

128521336 is a deficient number, since it is larger than the sum of its proper divisors (112709264).

128521336 is a wasteful number, since it uses less digits than its factorization.

128521336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16878 (or 16874 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The square root of 128521336 is about 11336.7251003101. The cubic root of 128521336 is about 504.6517037639.

The spelling of 128521336 in words is "one hundred twenty-eight million, five hundred twenty-one thousand, three hundred thirty-six".