128511830 has 16 divisors (see below), whose sum is σ = 231717024. Its totient is φ = 51316800.

The previous prime is 128511827. The next prime is 128511863. The reversal of 128511830 is 38115821.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 128511793 and 128511802.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4682 + ... + 16701.

It is an arithmetic number, because the mean of its divisors is an integer number (14482314).

Almost surely, 2^128511830 is an apocalyptic number.

128511830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128511830 is a deficient number, since it is larger than the sum of its proper divisors (103205194).

128511830 is a wasteful number, since it uses less digits than its factorization.

128511830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21991.

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 128511830 is about 11336.3058356768. The cubic root of 128511830 is about 504.6392613749.

The spelling of 128511830 in words is "one hundred twenty-eight million, five hundred eleven thousand, eight hundred thirty".