231504640 has 72 divisors (see below), whose sum is σ = 587200320. Its totient is φ = 87146496.

The previous prime is 231504629. The next prime is 231504643. The reversal of 231504640 is 46405132.

It is not an unprimeable number, because it can be changed into a prime (231504643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16441 + ... + 27079.

It is an arithmetic number, because the mean of its divisors is an integer number (8155560).

Almost surely, 2^231504640 is an apocalyptic number.

231504640 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 231504640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (293600160).

231504640 is an abundant number, since it is smaller than the sum of its proper divisors (355695680).

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

231504640 is a wasteful number, since it uses less digits than its factorization.

231504640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10677 (or 10663 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 231504640 is about 15215.2765337998. The cubic root of 231504640 is about 614.0257251014.

Adding to 231504640 its reverse (46405132), we get a palindrome (277909772).

The spelling of 231504640 in words is "two hundred thirty-one million, five hundred four thousand, six hundred forty".