231220464 has 20 divisors (see below), whose sum is σ = 597319656. Its totient is φ = 77073472.

The previous prime is 231220463. The next prime is 231220489. The reversal of 231220464 is 464022132.

231220464 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231220463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2408499 + ... + 2408594.

Almost surely, 2^231220464 is an apocalyptic number.

231220464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

231220464 is an abundant number, since it is smaller than the sum of its proper divisors (366099192).

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

231220464 is a wasteful number, since it uses less digits than its factorization.

231220464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4817104 (or 4817098 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 231220464 is about 15205.9351570365. The cubic root of 231220464 is about 613.7743797860.

Adding to 231220464 its reverse (464022132), we get a palindrome (695242596).

The spelling of 231220464 in words is "two hundred thirty-one million, two hundred twenty thousand, four hundred sixty-four".