1281540000 has 480 divisors, whose sum is σ = 4761275904. Its totient is φ = 299520000.

The previous prime is 1281539983. The next prime is 1281540011. The reversal of 1281540000 is 451821.

It is a tau number, because it is divible by the number of its divisors (480).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 24179974 + ... + 24180026.

Almost surely, 2^1281540000 is an apocalyptic number.

1281540000 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 1281540000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2380637952).

1281540000 is an abundant number, since it is smaller than the sum of its proper divisors (3479735904).

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

1281540000 is a wasteful number, since it uses less digits than its factorization.

1281540000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 1281540000 is about 35798.6033247109. The cubic root of 1281540000 is about 1086.2023099519.

Adding to 1281540000 its reverse (451821), we get a palindrome (1281991821).

The spelling of 1281540000 in words is "one billion, two hundred eighty-one million, five hundred forty thousand".