231304428 has 36 divisors (see below), whose sum is σ = 585523848. Its totient is φ = 76991040.

The previous prime is 231304421. The next prime is 231304433. The reversal of 231304428 is 824403132.

231304428 is a `hidden beast` number, since 231 + 3 + 0 + 4 + 428 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231304421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23175 + ... + 31617.

Almost surely, 2^231304428 is an apocalyptic number.

It is an amenable number.

231304428 is an abundant number, since it is smaller than the sum of its proper divisors (354219420).

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

231304428 is a wasteful number, since it uses less digits than its factorization.

231304428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9214 (or 9209 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 231304428 is about 15208.6958020732. The cubic root of 231304428 is about 613.8486648995.

The spelling of 231304428 in words is "two hundred thirty-one million, three hundred four thousand, four hundred twenty-eight".