23453043440 has 20 divisors (see below), whose sum is σ = 54528326184. Its totient is φ = 9381217344.

The previous prime is 23453043421. The next prime is 23453043461. The reversal of 23453043440 is 4434035432.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 23453043397 and 23453043406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146581442 + ... + 146581601.

Almost surely, 2^23453043440 is an apocalyptic number.

23453043440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23453043440 is an abundant number, since it is smaller than the sum of its proper divisors (31075282744).

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

23453043440 is a wasteful number, since it uses less digits than its factorization.

23453043440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293163056 (or 293163050 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 32.

Adding to 23453043440 its reverse (4434035432), we get a palindrome (27887078872).

The spelling of 23453043440 in words is "twenty-three billion, four hundred fifty-three million, forty-three thousand, four hundred forty".