231646320 has 120 divisors (see below), whose sum is σ = 782445456. Its totient is φ = 61415424.

The previous prime is 231646297. The next prime is 231646321. The reversal of 231646320 is 23646132.

231646320 is a `hidden beast` number, since 23 + 1 + 6 + 4 + 632 + 0 = 666.

231646320 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 (120).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231646321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 138127 + ... + 139793.

Almost surely, 2^231646320 is an apocalyptic number.

231646320 is a gapful number since it is divisible by the number (20) 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 231646320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (391222728).

231646320 is an abundant number, since it is smaller than the sum of its proper divisors (550799136).

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

231646320 is a wasteful number, since it uses less digits than its factorization.

231646320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1879 (or 1870 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 231646320 is about 15219.9316687034. The cubic root of 231646320 is about 614.1509600626.

The spelling of 231646320 in words is "two hundred thirty-one million, six hundred forty-six thousand, three hundred twenty".