128456331 has 8 divisors (see below), whose sum is σ = 171440784. Its totient is φ = 85554720.

The previous prime is 128456329. The next prime is 128456333. The reversal of 128456331 is 133654821.

It is an interprime number because it is at equal distance from previous prime (128456329) and next prime (128456333).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128456331 - 2¹ = 128456329 is a prime.

It is a super-2 number, since 2×128456331² = 33002057947963122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128456292 and 128456301.

It is not an unprimeable number, because it can be changed into a prime (128456333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16996 + ... + 23361.

It is an arithmetic number, because the mean of its divisors is an integer number (21430098).

Almost surely, 2^128456331 is an apocalyptic number.

128456331 is a deficient number, since it is larger than the sum of its proper divisors (42984453).

128456331 is a wasteful number, since it uses less digits than its factorization.

128456331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41421.

The product of its digits is 17280, while the sum is 33.

The square root of 128456331 is about 11333.8577280642. The cubic root of 128456331 is about 504.5666065669.

The spelling of 128456331 in words is "one hundred twenty-eight million, four hundred fifty-six thousand, three hundred thirty-one".