23135430640 has 80 divisors (see below), whose sum is σ = 61587343872. Its totient is φ = 7917541632.

The previous prime is 23135430631. The next prime is 23135430761. The reversal of 23135430640 is 4603453132.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 268557 + ... + 344083.

Almost surely, 2^23135430640 is an apocalyptic number.

23135430640 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 23135430640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30793671936).

23135430640 is an abundant number, since it is smaller than the sum of its proper divisors (38451913232).

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

23135430640 is a wasteful number, since it uses less digits than its factorization.

23135430640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76094 (or 76088 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 31.

Adding to 23135430640 its reverse (4603453132), we get a palindrome (27738883772).

The spelling of 23135430640 in words is "twenty-three billion, one hundred thirty-five million, four hundred thirty thousand, six hundred forty".