128281830 has 32 divisors (see below), whose sum is σ = 325988064. Its totient is φ = 32196096.

The previous prime is 128281801. The next prime is 128281831. The reversal of 128281830 is 38182821.

It is a super-3 number, since 3×128281830³ (a number of 25 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128281791 and 128281800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128281831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125257 + ... + 126276.

It is an arithmetic number, because the mean of its divisors is an integer number (10187127).

Almost surely, 2^128281830 is an apocalyptic number.

128281830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128281830 is an abundant number, since it is smaller than the sum of its proper divisors (197706234).

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

128281830 is a wasteful number, since it uses less digits than its factorization.

128281830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251560.

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 128281830 is about 11326.1568945517. The cubic root of 128281830 is about 504.3380275210.

Subtracting from 128281830 its reverse (38182821), we obtain a palindrome (90099009).

The spelling of 128281830 in words is "one hundred twenty-eight million, two hundred eighty-one thousand, eight hundred thirty".