231720426432 has 224 divisors, whose sum is σ = 745039952640. Its totient is φ = 70039157760.

The previous prime is 231720426407. The next prime is 231720426439. The reversal of 231720426432 is 234624027132.

231720426432 is a `hidden beast` number, since 2 + 3 + 1 + 7 + 2 + 0 + 4 + 2 + 643 + 2 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231720426439) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7530823 + ... + 7561529.

Almost surely, 2^231720426432 is an apocalyptic number.

231720426432 is a gapful number since it is divisible by the number (22) 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 231720426432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (372519976320).

231720426432 is an abundant number, since it is smaller than the sum of its proper divisors (513319526208).

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

231720426432 is a wasteful number, since it uses less digits than its factorization.

231720426432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31136 (or 31120 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 36.

The spelling of 231720426432 in words is "two hundred thirty-one billion, seven hundred twenty million, four hundred twenty-six thousand, four hundred thirty-two".