1280871040 has 32 divisors (see below), whose sum is σ = 3062083860. Its totient is φ = 512348160.

The previous prime is 1280871019. The next prime is 1280871041. The reversal of 1280871040 is 401780821.

It can be written as a sum of positive squares in 2 ways, for example, as 1239603264 + 41267776 = 35208^2 + 6424^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×1280871040² = 3281261242221363200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1280870993 and 1280871011.

It is not an unprimeable number, because it can be changed into a prime (1280871041) 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, 1000041 + ... + 1001320.

Almost surely, 2^1280871040 is an apocalyptic number.

1280871040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1280871040 is an abundant number, since it is smaller than the sum of its proper divisors (1781212820).

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

1280871040 is an equidigital number, since it uses as much as digits as its factorization.

1280871040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2001380 (or 2001368 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 1280871040 is about 35789.2587238127. The cubic root of 1280871040 is about 1086.0132789511.

The spelling of 1280871040 in words is "one billion, two hundred eighty million, eight hundred seventy-one thousand, forty".