231809666928 has 80 divisors (see below), whose sum is σ = 690669365760. Its totient is φ = 65623696128.

The previous prime is 231809666909. The next prime is 231809666929. The reversal of 231809666928 is 829666908132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231809666929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3128100 + ... + 3201347.

It is an arithmetic number, because the mean of its divisors is an integer number (8633367072).

Almost surely, 2^231809666928 is an apocalyptic number.

231809666928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

231809666928 is an abundant number, since it is smaller than the sum of its proper divisors (458859698832).

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

231809666928 is a wasteful number, since it uses less digits than its factorization.

231809666928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6329574 (or 6329568 counting only the distinct ones).

The product of its (nonzero) digits is 13436928, while the sum is 60.

The spelling of 231809666928 in words is "two hundred thirty-one billion, eight hundred nine million, six hundred sixty-six thousand, nine hundred twenty-eight".