231238010640 has 320 divisors, whose sum is σ = 934161209856. Its totient is φ = 45918683136.

The previous prime is 231238010629. The next prime is 231238010659. The reversal of 231238010640 is 46010832132.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 231238010598 and 231238010607.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 59874 + ... + 682686.

Almost surely, 2^231238010640 is an apocalyptic number.

231238010640 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 231238010640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (467080604928).

231238010640 is an abundant number, since it is smaller than the sum of its proper divisors (702923199216).

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

231238010640 is a wasteful number, since it uses less digits than its factorization.

231238010640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622866 (or 622860 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

Adding to 231238010640 its reverse (46010832132), we get a palindrome (277248842772).

The spelling of 231238010640 in words is "two hundred thirty-one billion, two hundred thirty-eight million, ten thousand, six hundred forty".