128918625 has 32 divisors (see below), whose sum is σ = 234029952. Its totient is φ = 62504000.

The previous prime is 128918617. The next prime is 128918639. The reversal of 128918625 is 526819821.

It is a happy number.

It is not a de Polignac number, because 128918625 - 2³ = 128918617 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11502 + ... + 19751.

It is an arithmetic number, because the mean of its divisors is an integer number (7313436).

Almost surely, 2^128918625 is an apocalyptic number.

128918625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128918625 is a deficient number, since it is larger than the sum of its proper divisors (105111327).

128918625 is a wasteful number, since it uses less digits than its factorization.

128918625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31282 (or 31272 counting only the distinct ones).

The product of its digits is 69120, while the sum is 42.

The square root of 128918625 is about 11354.2337918505. The cubic root of 128918625 is about 505.1711670206.

The spelling of 128918625 in words is "one hundred twenty-eight million, nine hundred eighteen thousand, six hundred twenty-five".