128170312 has 8 divisors (see below), whose sum is σ = 240319350. Its totient is φ = 64085152.

The previous prime is 128170309. The next prime is 128170369. The reversal of 128170312 is 213071821.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 121749156 + 6421156 = 11034^2 + 2534^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8010637 + ... + 8010652.

Almost surely, 2^128170312 is an apocalyptic number.

It is an amenable number.

128170312 is a deficient number, since it is larger than the sum of its proper divisors (112149038).

128170312 is a wasteful number, since it uses less digits than its factorization.

128170312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16021295 (or 16021291 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 128170312 is about 11321.2327950626. The cubic root of 128170312 is about 504.1918413888.

The spelling of 128170312 in words is "one hundred twenty-eight million, one hundred seventy thousand, three hundred twelve".