128231668 has 12 divisors (see below), whose sum is σ = 224592480. Its totient is φ = 64062392.

The previous prime is 128231659. The next prime is 128231671. The reversal of 128231668 is 866132821.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7696 + ... + 17767.

It is an arithmetic number, because the mean of its divisors is an integer number (18716040).

Almost surely, 2^128231668 is an apocalyptic number.

It is an amenable number.

128231668 is a deficient number, since it is larger than the sum of its proper divisors (96360812).

128231668 is a wasteful number, since it uses less digits than its factorization.

128231668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26726 (or 26724 counting only the distinct ones).

The product of its digits is 27648, while the sum is 37.

The square root of 128231668 is about 11323.9422464087. The cubic root of 128231668 is about 504.2722819088.

The spelling of 128231668 in words is "one hundred twenty-eight million, two hundred thirty-one thousand, six hundred sixty-eight".