1280682540 has 144 divisors (see below), whose sum is σ = 4029182976. Its totient is φ = 328924800.

The previous prime is 1280682521. The next prime is 1280682547. The reversal of 1280682540 is 452860821.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1280682495 and 1280682504.

It is not an unprimeable number, because it can be changed into a prime (1280682547) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1578735 + ... + 1579545.

Almost surely, 2^1280682540 is an apocalyptic number.

1280682540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1280682540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2014591488).

1280682540 is an abundant number, since it is smaller than the sum of its proper divisors (2748500436).

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

1280682540 is a wasteful number, since it uses less digits than its factorization.

1280682540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1140 (or 1135 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 1280682540 is about 35786.6251552169. The cubic root of 1280682540 is about 1085.9600017828.

The spelling of 1280682540 in words is "one billion, two hundred eighty million, six hundred eighty-two thousand, five hundred forty".