231612240 has 80 divisors (see below), whose sum is σ = 733310208. Its totient is φ = 60446208.

The previous prime is 231612221. The next prime is 231612259. The reversal of 231612240 is 42216132.

It is an interprime number because it is at equal distance from previous prime (231612221) and next prime (231612259).

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

It is a congruent number.

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, 1014 + ... + 21546.

Almost surely, 2^231612240 is an apocalyptic number.

231612240 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 231612240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (366655104).

231612240 is an abundant number, since it is smaller than the sum of its proper divisors (501697968).

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

231612240 is a wasteful number, since it uses less digits than its factorization.

231612240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20596 (or 20590 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 231612240 is about 15218.8120429947. The cubic root of 231612240 is about 614.1208404515.

Adding to 231612240 its reverse (42216132), we get a palindrome (273828372).

The spelling of 231612240 in words is "two hundred thirty-one million, six hundred twelve thousand, two hundred forty".