231673728 has 128 divisors (see below), whose sum is σ = 723139200. Its totient is φ = 64788480.

The previous prime is 231673709. The next prime is 231673751. The reversal of 231673728 is 827376132.

231673728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Smith number, since the sum of its digits (39) 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 (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52803 + ... + 57021.

It is an arithmetic number, because the mean of its divisors is an integer number (5649525).

Almost surely, 2^231673728 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 231673728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (361569600).

231673728 is an abundant number, since it is smaller than the sum of its proper divisors (491465472).

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

231673728 is a wasteful number, since it uses less digits than its factorization.

231673728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4260 (or 4248 counting only the distinct ones).

The product of its digits is 84672, while the sum is 39.

The square root of 231673728 is about 15220.8320403321. The cubic root of 231673728 is about 614.1751808743.

The spelling of 231673728 in words is "two hundred thirty-one million, six hundred seventy-three thousand, seven hundred twenty-eight".