231503030640 has 320 divisors, whose sum is σ = 911885445120. Its totient is φ = 52881776640.

The previous prime is 231503030623. The next prime is 231503030641. The reversal of 231503030640 is 46030305132.

It is a happy number.

231503030640 is a `hidden beast` number, since 2 + 3 + 15 + 0 + 3 + 0 + 3 + 0 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231503030641) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 30493245 + ... + 30500835.

It is an arithmetic number, because the mean of its divisors is an integer number (2849642016).

Almost surely, 2^231503030640 is an apocalyptic number.

231503030640 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 231503030640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (455942722560).

231503030640 is an abundant number, since it is smaller than the sum of its proper divisors (680382414480).

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

231503030640 is a wasteful number, since it uses less digits than its factorization.

231503030640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9637 (or 9625 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

Adding to 231503030640 its reverse (46030305132), we get a palindrome (277533335772).

The spelling of 231503030640 in words is "two hundred thirty-one billion, five hundred three million, thirty thousand, six hundred forty".