12553640 has 64 divisors (see below), whose sum is σ = 31224960. Its totient is φ = 4504320.

The previous prime is 12553637. The next prime is 12553649. The reversal of 12553640 is 4635521.

It is not an unprimeable number, because it can be changed into a prime (12553649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45182 + ... + 45458.

It is an arithmetic number, because the mean of its divisors is an integer number (487890).

Almost surely, 2^12553640 is an apocalyptic number.

12553640 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 12553640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15612480).

12553640 is an abundant number, since it is smaller than the sum of its proper divisors (18671320).

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

12553640 is a wasteful number, since it uses less digits than its factorization.

12553640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402 (or 398 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 12553640 is about 3543.1116268049. Note that the first 3 decimals coincide. The cubic root of 12553640 is about 232.4109343980.

The spelling of 12553640 in words is "twelve million, five hundred fifty-three thousand, six hundred forty".