128512998 has 36 divisors (see below), whose sum is σ = 293578740. Its totient is φ = 40516848.

The previous prime is 128512991. The next prime is 128512999. The reversal of 128512998 is 899215821.

128512998 is a `hidden beast` number, since 128 + 512 + 9 + 9 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128512991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 209340 + ... + 209952.

It is an arithmetic number, because the mean of its divisors is an integer number (8154965).

Almost surely, 2^128512998 is an apocalyptic number.

128512998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 128512998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146789370).

128512998 is an abundant number, since it is smaller than the sum of its proper divisors (165065742).

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

128512998 is an equidigital number, since it uses as much as digits as its factorization.

128512998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1253 (or 637 counting only the distinct ones).

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

The square root of 128512998 is about 11336.3573514599. The cubic root of 128512998 is about 504.6407902014.

The spelling of 128512998 in words is "one hundred twenty-eight million, five hundred twelve thousand, nine hundred ninety-eight".