231521680 has 80 divisors (see below), whose sum is σ = 604961280. Its totient is φ = 81759744.

The previous prime is 231521677. The next prime is 231521681. The reversal of 231521680 is 86125132.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (231521681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19081 + ... + 28759.

It is an arithmetic number, because the mean of its divisors is an integer number (7562016).

Almost surely, 2^231521680 is an apocalyptic number.

231521680 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 231521680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (302480640).

231521680 is an abundant number, since it is smaller than the sum of its proper divisors (373439600).

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

231521680 is a wasteful number, since it uses less digits than its factorization.

231521680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9728 (or 9722 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 231521680 is about 15215.8364870289. The cubic root of 231521680 is about 614.0407899422.

The spelling of 231521680 in words is "two hundred thirty-one million, five hundred twenty-one thousand, six hundred eighty".