128551312 has 20 divisors (see below), whose sum is σ = 249289600. Its totient is φ = 64218528.

The previous prime is 128551309. The next prime is 128551337. The reversal of 128551312 is 213155821.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19513 + ... + 25255.

It is an arithmetic number, because the mean of its divisors is an integer number (12464480).

Almost surely, 2^128551312 is an apocalyptic number.

It is an amenable number.

128551312 is a deficient number, since it is larger than the sum of its proper divisors (120738288).

128551312 is a wasteful number, since it uses less digits than its factorization.

128551312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7150 (or 7144 counting only the distinct ones).

The product of its digits is 2400, while the sum is 28.

The square root of 128551312 is about 11338.0470981558. The cubic root of 128551312 is about 504.6909352877.

The spelling of 128551312 in words is "one hundred twenty-eight million, five hundred fifty-one thousand, three hundred twelve".