128972516 has 6 divisors (see below), whose sum is σ = 225701910. Its totient is φ = 64486256.

The previous prime is 128972449. The next prime is 128972527. The reversal of 128972516 is 615279821.

It can be written as a sum of positive squares in only one way, i.e., 121660900 + 7311616 = 11030^2 + 2704^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16121561 + ... + 16121568.

It is an arithmetic number, because the mean of its divisors is an integer number (37616985).

Almost surely, 2^128972516 is an apocalyptic number.

It is an amenable number.

128972516 is a deficient number, since it is larger than the sum of its proper divisors (96729394).

128972516 is a wasteful number, since it uses less digits than its factorization.

128972516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32243133 (or 32243131 counting only the distinct ones).

The product of its digits is 60480, while the sum is 41.

The square root of 128972516 is about 11356.6067115138. The cubic root of 128972516 is about 505.2415483349.

The spelling of 128972516 in words is "one hundred twenty-eight million, nine hundred seventy-two thousand, five hundred sixteen".