231375728 has 20 divisors (see below), whose sum is σ = 448535280. Its totient is φ = 115624704.

The previous prime is 231375719. The next prime is 231375743. The reversal of 231375728 is 827573132.

It is a junction number, because it is equal to n+sod(n) for n = 231375691 and 231375700.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43688 + ... + 48696.

It is an arithmetic number, because the mean of its divisors is an integer number (22426764).

Almost surely, 2^231375728 is an apocalyptic number.

It is an amenable number.

231375728 is a deficient number, since it is larger than the sum of its proper divisors (217159552).

231375728 is a wasteful number, since it uses less digits than its factorization.

231375728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7904 (or 7898 counting only the distinct ones).

The product of its digits is 70560, while the sum is 38.

The square root of 231375728 is about 15211.0396751833. The cubic root of 231375728 is about 613.9117317329.

The spelling of 231375728 in words is "two hundred thirty-one million, three hundred seventy-five thousand, seven hundred twenty-eight".