231604224 has 144 divisors (see below), whose sum is σ = 671086080. Its totient is φ = 70778880.

The previous prime is 231604199. The next prime is 231604229. The reversal of 231604224 is 422406132.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 231604194 and 231604203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231604229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7471089 + ... + 7471119.

It is an arithmetic number, because the mean of its divisors is an integer number (4660320).

Almost surely, 2^231604224 is an apocalyptic number.

231604224 is a gapful number since it is divisible by the number (24) 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 231604224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (335543040).

231604224 is an abundant number, since it is smaller than the sum of its proper divisors (439481856).

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

231604224 is an frugal number, since it uses more digits than its factorization.

231604224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87 (or 55 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 231604224 is about 15218.5486824467. The cubic root of 231604224 is about 614.1137555504.

The spelling of 231604224 in words is "two hundred thirty-one million, six hundred four thousand, two hundred twenty-four".