231647128128 has 560 divisors, whose sum is σ = 784926690240. Its totient is φ = 66960691200.

The previous prime is 231647128079. The next prime is 231647128151. The reversal of 231647128128 is 821821746132.

231647128128 is a `hidden beast` number, since 2 + 31 + 6 + 471 + 28 + 128 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 167737998 + ... + 167739378.

It is an arithmetic number, because the mean of its divisors is an integer number (1401654804).

Almost surely, 2^231647128128 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 231647128128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (392463345120).

231647128128 is an abundant number, since it is smaller than the sum of its proper divisors (553279562112).

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

231647128128 is a wasteful number, since it uses less digits than its factorization.

231647128128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1568 (or 1549 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The spelling of 231647128128 in words is "two hundred thirty-one billion, six hundred forty-seven million, one hundred twenty-eight thousand, one hundred twenty-eight".