12645520 has 40 divisors (see below), whose sum is σ = 30355200. Its totient is φ = 4894080.

The previous prime is 12645509. The next prime is 12645533. The reversal of 12645520 is 2554621.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70 + ... + 5029.

It is an arithmetic number, because the mean of its divisors is an integer number (758880).

Almost surely, 2^12645520 is an apocalyptic number.

12645520 is a gapful number since it is divisible by the number (10) 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 12645520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15177600).

12645520 is an abundant number, since it is smaller than the sum of its proper divisors (17709680).

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

12645520 is a wasteful number, since it uses less digits than its factorization.

12645520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5143 (or 5137 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 12645520 is about 3556.0539928409. The cubic root of 12645520 is about 232.9765613415.

The spelling of 12645520 in words is "twelve million, six hundred forty-five thousand, five hundred twenty".