128115732 has 12 divisors (see below), whose sum is σ = 298936736. Its totient is φ = 42705240.

The previous prime is 128115721. The next prime is 128115739. The reversal of 128115732 is 237511821.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 128115732.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128115739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5338144 + ... + 5338167.

Almost surely, 2^128115732 is an apocalyptic number.

128115732 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128115732 is an abundant number, since it is smaller than the sum of its proper divisors (170821004).

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

128115732 is a wasteful number, since it uses less digits than its factorization.

128115732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10676318 (or 10676316 counting only the distinct ones).

The product of its digits is 3360, while the sum is 30.

The square root of 128115732 is about 11318.8220235146. The cubic root of 128115732 is about 504.1202629361.

The spelling of 128115732 in words is "one hundred twenty-eight million, one hundred fifteen thousand, seven hundred thirty-two".