1280764 has 12 divisors (see below), whose sum is σ = 2254000. Its totient is φ = 636768.

The previous prime is 1280761. The next prime is 1280767. The reversal of 1280764 is 4670821.

It is an interprime number because it is at equal distance from previous prime (1280761) and next prime (1280767).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280761) 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, 9 + ... + 1600.

2^1280764 is an apocalyptic number.

It is an amenable number.

1280764 is a deficient number, since it is larger than the sum of its proper divisors (973236).

1280764 is a wasteful number, since it uses less digits than its factorization.

1280764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1812 (or 1810 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 1280764 is about 1131.7084430188. The cubic root of 1280764 is about 108.5983026075.

The spelling of 1280764 in words is "one million, two hundred eighty thousand, seven hundred sixty-four".