128436231 has 64 divisors (see below), whose sum is σ = 222953472. Its totient is φ = 63840000.

The previous prime is 128436223. The next prime is 128436233. The reversal of 128436231 is 132634821.

It is not a de Polignac number, because 128436231 - 2³ = 128436223 is a prime.

It is a super-2 number, since 2×128436231² = 32991730866970722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128436233) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 672346 + ... + 672536.

It is an arithmetic number, because the mean of its divisors is an integer number (3483648).

Almost surely, 2^128436231 is an apocalyptic number.

128436231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

128436231 is a deficient number, since it is larger than the sum of its proper divisors (94517241).

128436231 is a wasteful number, since it uses less digits than its factorization.

128436231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324.

The product of its digits is 6912, while the sum is 30.

The square root of 128436231 is about 11332.9709696972. The cubic root of 128436231 is about 504.5402881085.

The spelling of 128436231 in words is "one hundred twenty-eight million, four hundred thirty-six thousand, two hundred thirty-one".