128918532 has 12 divisors (see below), whose sum is σ = 300809936. Its totient is φ = 42972840.

The previous prime is 128918513. The next prime is 128918557. The reversal of 128918532 is 235819821.

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

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, 5371594 + ... + 5371617.

Almost surely, 2^128918532 is an apocalyptic number.

128918532 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128918532 is an abundant number, since it is smaller than the sum of its proper divisors (171891404).

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

128918532 is a wasteful number, since it uses less digits than its factorization.

128918532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10743218 (or 10743216 counting only the distinct ones).

The product of its digits is 34560, while the sum is 39.

The square root of 128918532 is about 11354.2296964611. The cubic root of 128918532 is about 505.1710455462.

The spelling of 128918532 in words is "one hundred twenty-eight million, nine hundred eighteen thousand, five hundred thirty-two".