231105728 has 28 divisors (see below), whose sum is σ = 524115792. Its totient is φ = 99045120.

The previous prime is 231105703. The next prime is 231105733. The reversal of 231105728 is 827501132.

It is a tau number, because it is divible by the number of its divisors (28).

It is a self number, because there is not a number n which added to its sum of digits gives 231105728.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 257483 + ... + 258378.

Almost surely, 2^231105728 is an apocalyptic number.

231105728 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

231105728 is an abundant number, since it is smaller than the sum of its proper divisors (293010064).

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

231105728 is an equidigital number, since it uses as much as digits as its factorization.

231105728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515880 (or 515870 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 231105728 is about 15202.1619515120. The cubic root of 231105728 is about 613.6728408082.

The spelling of 231105728 in words is "two hundred thirty-one million, one hundred five thousand, seven hundred twenty-eight".