1288644 has 72 divisors (see below), whose sum is σ = 3716160. Its totient is φ = 340032.

The previous prime is 1288643. The next prime is 1288649. The reversal of 1288644 is 4468821.

Its product of digits (12288) is a multiple of the sum of its prime divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1288643) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44422 + ... + 44450.

2^1288644 is an apocalyptic number.

1288644 is a gapful number since it is divisible by the number (14) 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 1288644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1858080).

1288644 is an abundant number, since it is smaller than the sum of its proper divisors (2427516).

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

1288644 is a wasteful number, since it uses less digits than its factorization.

1288644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89 (or 64 counting only the distinct ones).

The product of its digits is 12288, while the sum is 33.

The square root of 1288644 is about 1135.1845664913. The cubic root of 1288644 is about 108.8205672263.

The spelling of 1288644 in words is "one million, two hundred eighty-eight thousand, six hundred forty-four".