1281568 has 24 divisors (see below), whose sum is σ = 2611980. Its totient is φ = 618240.

The previous prime is 1281563. The next prime is 1281587. The reversal of 1281568 is 8651821.

It can be written as a sum of positive squares in 2 ways, for example, as 1281424 + 144 = 1132^2 + 12^2 .

It is not an unprimeable number, because it can be changed into a prime (1281563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238 + ... + 1618.

2^1281568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1281568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1305990).

1281568 is an abundant number, since it is smaller than the sum of its proper divisors (1330412).

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

1281568 is a wasteful number, since it uses less digits than its factorization.

1281568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1420 (or 1412 counting only the distinct ones).

The product of its digits is 3840, while the sum is 31.

The square root of 1281568 is about 1132.0636024535. The cubic root of 1281568 is about 108.6210220602.

It can be divided in two parts, 128156 and 8, that added together give a square (128164 = 358²).

The spelling of 1281568 in words is "one million, two hundred eighty-one thousand, five hundred sixty-eight".