128117412 has 36 divisors (see below), whose sum is σ = 326194960. Its totient is φ = 42396912.

The previous prime is 128117387. The next prime is 128117419. The reversal of 128117412 is 214711821.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×128117412³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (128117419) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7798 + ... + 17805.

Almost surely, 2^128117412 is an apocalyptic number.

128117412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128117412 is an abundant number, since it is smaller than the sum of its proper divisors (198077548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128117412 is a wasteful number, since it uses less digits than its factorization.

128117412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25752 (or 25747 counting only the distinct ones).

The product of its digits is 896, while the sum is 27.

The square root of 128117412 is about 11318.8962359410. The cubic root of 128117412 is about 504.1224664603.

The spelling of 128117412 in words is "one hundred twenty-eight million, one hundred seventeen thousand, four hundred twelve".