231232720 has 40 divisors (see below), whose sum is σ = 554964480. Its totient is φ = 89508480.

The previous prime is 231232699. The next prime is 231232723. The reversal of 231232720 is 27232132.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 231232691 and 231232700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231232723) 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, 44140 + ... + 49099.

It is an arithmetic number, because the mean of its divisors is an integer number (13874112).

Almost surely, 2^231232720 is an apocalyptic number.

231232720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231232720 is an abundant number, since it is smaller than the sum of its proper divisors (323731760).

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

231232720 is a wasteful number, since it uses less digits than its factorization.

231232720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93283 (or 93277 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 231232720 is about 15206.3381522311. The cubic root of 231232720 is about 613.7852241057.

Adding to 231232720 its reverse (27232132), we get a palindrome (258464852).

The spelling of 231232720 in words is "two hundred thirty-one million, two hundred thirty-two thousand, seven hundred twenty".