128256498 has 24 divisors (see below), whose sum is σ = 292515600. Its totient is φ = 40501944.

The previous prime is 128256461. The next prime is 128256521. The reversal of 128256498 is 894652821.

128256498 is a `hidden beast` number, since 1 + 2 + 82 + 564 + 9 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 187168 + ... + 187851.

It is an arithmetic number, because the mean of its divisors is an integer number (12188150).

Almost surely, 2^128256498 is an apocalyptic number.

128256498 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

128256498 is an abundant number, since it is smaller than the sum of its proper divisors (164259102).

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

128256498 is a wasteful number, since it uses less digits than its factorization.

128256498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375046 (or 375043 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 128256498 is about 11325.0385429808. The cubic root of 128256498 is about 504.3048278804.

The spelling of 128256498 in words is "one hundred twenty-eight million, two hundred fifty-six thousand, four hundred ninety-eight".