12813453440 has 32 divisors (see below), whose sum is σ = 30632163660. Its totient is φ = 5125381120.

The previous prime is 12813453437. The next prime is 12813453451. The reversal of 12813453440 is 4435431821.

It can be written as a sum of positive squares in 2 ways, for example, as 12801564736 + 11888704 = 113144^2 + 3448^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 12813453440.

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, 10009871 + ... + 10011150.

Almost surely, 2^12813453440 is an apocalyptic number.

12813453440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12813453440 is an abundant number, since it is smaller than the sum of its proper divisors (17818710220).

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

12813453440 is an equidigital number, since it uses as much as digits as its factorization.

12813453440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20021040 (or 20021028 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 35.

The spelling of 12813453440 in words is "twelve billion, eight hundred thirteen million, four hundred fifty-three thousand, four hundred forty".