231978880 has 128 divisors (see below), whose sum is σ = 646418880. Its totient is φ = 77955072.

The previous prime is 231978853. The next prime is 231978881. The reversal of 231978880 is 88879132.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 231978880.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231978881) 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, 236952 + ... + 237928.

Almost surely, 2^231978880 is an apocalyptic number.

231978880 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 231978880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (323209440).

231978880 is an abundant number, since it is smaller than the sum of its proper divisors (414440000).

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

231978880 is an equidigital number, since it uses as much as digits as its factorization.

231978880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056 (or 1044 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 231978880 is about 15230.8528979831. The cubic root of 231978880 is about 614.4447187865. Note that the first 3 decimals are identical.

The spelling of 231978880 in words is "two hundred thirty-one million, nine hundred seventy-eight thousand, eight hundred eighty".