1288780 has 12 divisors (see below), whose sum is σ = 2706480. Its totient is φ = 515504.

The previous prime is 1288769. The next prime is 1288783. The reversal of 1288780 is 878821.

It is not an unprimeable number, because it can be changed into a prime (1288783) 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, 32200 + ... + 32239.

It is an arithmetic number, because the mean of its divisors is an integer number (225540).

2^1288780 is an apocalyptic number.

1288780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1288780 is an abundant number, since it is smaller than the sum of its proper divisors (1417700).

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

1288780 is a wasteful number, since it uses less digits than its factorization.

1288780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64448 (or 64446 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 34.

The square root of 1288780 is about 1135.2444670643. The cubic root of 1288780 is about 108.8243953010.

The spelling of 1288780 in words is "one million, two hundred eighty-eight thousand, seven hundred eighty".