231997841497728 has 160 divisors (see below), whose sum is σ = 694412699997060. Its totient is φ = 76885603909632.

The previous prime is 231997841497663. The next prime is 231997841497757. The reversal of 231997841497728 is 827794148799132.

231997841497728 is a `hidden beast` number, since 2 + 3 + 1 + 9 + 97 + 8 + 414 + 97 + 7 + 28 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 202370199073344 + 29627642424384 = 14225688^2 + 5443128^2 .

It is a super-4 number, since 4×231997841497728⁴ (a number of 59 digits) contains 4444 as substring.

It is a Smith number, since the sum of its digits (81) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 62877825 + ... + 66465152.

Almost surely, 2^{231997841497728} is an apocalyptic number.

It is an amenable number.

231997841497728 is an abundant number, since it is smaller than the sum of its proper divisors (462414858499332).

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

231997841497728 is a wasteful number, since it uses less digits than its factorization.

231997841497728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129343176 (or 129343155 counting only the distinct ones).

The product of its digits is 3072577536, while the sum is 81.

The spelling of 231997841497728 in words is "two hundred thirty-one trillion, nine hundred ninety-seven billion, eight hundred forty-one million, four hundred ninety-seven thousand, seven hundred twenty-eight".