1287568 has 10 divisors (see below), whose sum is σ = 2494694. Its totient is φ = 643776.

The previous prime is 1287553. The next prime is 1287569. The reversal of 1287568 is 8657821.

It can be written as a sum of positive squares in only one way, i.e., 1149184 + 138384 = 1072^2 + 372^2 .

It is not an unprimeable number, because it can be changed into a prime (1287569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40221 + ... + 40252.

2^1287568 is an apocalyptic number.

It is an amenable number.

1287568 is a deficient number, since it is larger than the sum of its proper divisors (1207126).

1287568 is an equidigital number, since it uses as much as digits as its factorization.

1287568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80481 (or 80475 counting only the distinct ones).

The product of its digits is 26880, while the sum is 37.

The square root of 1287568 is about 1134.7105357755. The cubic root of 1287568 is about 108.7902709005.

The spelling of 1287568 in words is "one million, two hundred eighty-seven thousand, five hundred sixty-eight".