135128872 has 8 divisors (see below), whose sum is σ = 253366650. Its totient is φ = 67564432.

The previous prime is 135128867. The next prime is 135128923. The reversal of 135128872 is 278821531.

It can be written as a sum of positive squares in only one way, i.e., 95765796 + 39363076 = 9786^2 + 6274^2 .

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

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8445547 + ... + 8445562.

Almost surely, 2^135128872 is an apocalyptic number.

It is an amenable number.

135128872 is a deficient number, since it is larger than the sum of its proper divisors (118237778).

135128872 is a wasteful number, since it uses less digits than its factorization.

135128872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16891115 (or 16891111 counting only the distinct ones).

The product of its digits is 26880, while the sum is 37.

The square root of 135128872 is about 11624.4944836324. The cubic root of 135128872 is about 513.1559676591.

The spelling of 135128872 in words is "one hundred thirty-five million, one hundred twenty-eight thousand, eight hundred seventy-two".