1288664 has 16 divisors (see below), whose sum is σ = 2602320. Its totient is φ = 594720.

The previous prime is 1288657. The next prime is 1288691. The reversal of 1288664 is 4668821.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6092 + ... + 6299.

It is an arithmetic number, because the mean of its divisors is an integer number (162645).

2^1288664 is an apocalyptic number.

It is an amenable number.

1288664 is an abundant number, since it is smaller than the sum of its proper divisors (1313656).

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

1288664 is a wasteful number, since it uses less digits than its factorization.

1288664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12410 (or 12406 counting only the distinct ones).

The product of its digits is 18432, while the sum is 35.

The square root of 1288664 is about 1135.1933755973. The cubic root of 1288664 is about 108.8211301953.

The spelling of 1288664 in words is "one million, two hundred eighty-eight thousand, six hundred sixty-four".