231706621440 has 1440 divisors, whose sum is σ = 1006690433760. Its totient is φ = 50331746304.

The previous prime is 231706621409. The next prime is 231706621453. The reversal of 231706621440 is 44126607132.

231706621440 is a `hidden beast` number, since 23 + 1 + 7 + 0 + 6 + 621 + 4 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1440).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 231706621395 and 231706621404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 5388526059 + ... + 5388526101.

It is an arithmetic number, because the mean of its divisors is an integer number (699090579).

Almost surely, 2^231706621440 is an apocalyptic number.

231706621440 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 231706621440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (503345216880).

231706621440 is an abundant number, since it is smaller than the sum of its proper divisors (774983812320).

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

231706621440 is an equidigital number, since it uses as much as digits as its factorization.

231706621440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 97 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The spelling of 231706621440 in words is "two hundred thirty-one billion, seven hundred six million, six hundred twenty-one thousand, four hundred forty".