231035728 has 80 divisors (see below), whose sum is σ = 560928384. Its totient is φ = 89556480.

The previous prime is 231035699. The next prime is 231035741. The reversal of 231035728 is 827530132.

It is a super-3 number, since 3×231035728³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 231035728.

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 15 ways as a sum of consecutive naturals, for example, 340926 + ... + 341602.

Almost surely, 2^231035728 is an apocalyptic number.

231035728 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231035728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280464192).

231035728 is an abundant number, since it is smaller than the sum of its proper divisors (329892656).

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

231035728 is a wasteful number, since it uses less digits than its factorization.

231035728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980 (or 974 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 231035728 is about 15199.8594730346. The cubic root of 231035728 is about 613.6108757543.

The spelling of 231035728 in words is "two hundred thirty-one million, thirty-five thousand, seven hundred twenty-eight".