231655680 has 144 divisors (see below), whose sum is σ = 822178560. Its totient is φ = 61765632.

The previous prime is 231655679. The next prime is 231655693. The reversal of 231655680 is 86556132.

231655680 is a `hidden beast` number, since 2 + 31 + 65 + 568 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31209 + ... + 37911.

Almost surely, 2^231655680 is an apocalyptic number.

231655680 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 231655680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (411089280).

231655680 is an abundant number, since it is smaller than the sum of its proper divisors (590522880).

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

231655680 is an equidigital number, since it uses as much as digits as its factorization.

231655680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6733 (or 6713 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 231655680 is about 15220.2391571223. The cubic root of 231655680 is about 614.1592318331.

The spelling of 231655680 in words is "two hundred thirty-one million, six hundred fifty-five thousand, six hundred eighty".