128346831 has 12 divisors (see below), whose sum is σ = 193450608. Its totient is φ = 81844224.

The previous prime is 128346817. The next prime is 128346833. The reversal of 128346831 is 138643821.

It is not a de Polignac number, because 128346831 - 2²¹ = 126249679 is a prime.

It is a super-2 number, since 2×128346831² = 32945818055485122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128346833) 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 11 ways as a sum of consecutive naturals, for example, 309810 + ... + 310223.

It is an arithmetic number, because the mean of its divisors is an integer number (16120884).

Almost surely, 2^128346831 is an apocalyptic number.

128346831 is a deficient number, since it is larger than the sum of its proper divisors (65103777).

128346831 is a wasteful number, since it uses less digits than its factorization.

128346831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620062 (or 620059 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 128346831 is about 11329.0260393381. The cubic root of 128346831 is about 504.4231966123.

The spelling of 128346831 in words is "one hundred twenty-eight million, three hundred forty-six thousand, eight hundred thirty-one".