1284805680 has 40 divisors (see below), whose sum is σ = 3982898352. Its totient is φ = 342614784.

The previous prime is 1284805679. The next prime is 1284805681. The reversal of 1284805680 is 865084821.

It is an interprime number because it is at equal distance from previous prime (1284805679) and next prime (1284805681).

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (1284805681) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2676439 + ... + 2676918.

Almost surely, 2^1284805680 is an apocalyptic number.

1284805680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1284805680 is an abundant number, since it is smaller than the sum of its proper divisors (2698092672).

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

1284805680 is a wasteful number, since it uses less digits than its factorization.

1284805680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5353373 (or 5353367 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 42.

The square root of 1284805680 is about 35844.1861394564. The cubic root of 1284805680 is about 1087.1241644863.

The spelling of 1284805680 in words is "one billion, two hundred eighty-four million, eight hundred five thousand, six hundred eighty".