1281318480 has 160 divisors (see below), whose sum is σ = 4753029120. Its totient is φ = 315394560.

The previous prime is 1281318461. The next prime is 1281318487. The reversal of 1281318480 is 848131821.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281318487) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5265 + ... + 50895.

It is an arithmetic number, because the mean of its divisors is an integer number (29706432).

Almost surely, 2^1281318480 is an apocalyptic number.

1281318480 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 1281318480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2376514560).

1281318480 is an abundant number, since it is smaller than the sum of its proper divisors (3471710640).

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

1281318480 is a wasteful number, since it uses less digits than its factorization.

1281318480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45666 (or 45654 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 1281318480 is about 35795.5092155427. The cubic root of 1281318480 is about 1086.1397213473.

The spelling of 1281318480 in words is "one billion, two hundred eighty-one million, three hundred eighteen thousand, four hundred eighty".