128998125 has 120 divisors (see below), whose sum is σ = 263165760. Its totient is φ = 60480000.

The previous prime is 128998123. The next prime is 128998139. The reversal of 128998125 is 521899821.

It is not a de Polignac number, because 128998125 - 2¹ = 128998123 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128998123) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 1816840 + ... + 1816910.

It is an arithmetic number, because the mean of its divisors is an integer number (2193048).

Almost surely, 2^128998125 is an apocalyptic number.

128998125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128998125 is an abundant number, since it is smaller than the sum of its proper divisors (134167635).

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

128998125 is a wasteful number, since it uses less digits than its factorization.

128998125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133 (or 115 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The square root of 128998125 is about 11357.7341490281. The cubic root of 128998125 is about 505.2749866594.

The spelling of 128998125 in words is "one hundred twenty-eight million, nine hundred ninety-eight thousand, one hundred twenty-five".