231668928 has 168 divisors, whose sum is σ = 716798160. Its totient is φ = 71270400.

The previous prime is 231668917. The next prime is 231668929. The reversal of 231668928 is 829866132.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (231668929) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 577528 + ... + 577928.

Almost surely, 2^231668928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231668928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (358399080).

231668928 is an abundant number, since it is smaller than the sum of its proper divisors (485129232).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231668928 is a wasteful number, since it uses less digits than its factorization.

231668928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495 (or 482 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 231668928 is about 15220.6743608816. The cubic root of 231668928 is about 614.1709391889.

The spelling of 231668928 in words is "two hundred thirty-one million, six hundred sixty-eight thousand, nine hundred twenty-eight".