128231667 has 10 divisors (see below), whose sum is σ = 191556068. Its totient is φ = 85487724.

The previous prime is 128231659. The next prime is 128231671. The reversal of 128231667 is 766132821.

128231667 is a `hidden beast` number, since 1 + 282 + 316 + 67 = 666.

It is not a de Polignac number, because 128231667 - 2³ = 128231659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128231617) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 791473 + ... + 791634.

Almost surely, 2^128231667 is an apocalyptic number.

128231667 is a deficient number, since it is larger than the sum of its proper divisors (63324401).

128231667 is an equidigital number, since it uses as much as digits as its factorization.

128231667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1583119 (or 1583110 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 128231667 is about 11323.9422022545. The cubic root of 128231667 is about 504.2722805979.

The spelling of 128231667 in words is "one hundred twenty-eight million, two hundred thirty-one thousand, six hundred sixty-seven".