1281034720 has 192 divisors, whose sum is σ = 3741534720. Its totient is φ = 404600832.

The previous prime is 1281034717. The next prime is 1281034763. The reversal of 1281034720 is 274301821.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 786547 + ... + 788173.

It is an arithmetic number, because the mean of its divisors is an integer number (19487160).

Almost surely, 2^1281034720 is an apocalyptic number.

1281034720 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 1281034720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1870767360).

1281034720 is an abundant number, since it is smaller than the sum of its proper divisors (2460500000).

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

1281034720 is a wasteful number, since it uses less digits than its factorization.

1281034720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1705 (or 1697 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 1281034720 is about 35791.5453703804. The cubic root of 1281034720 is about 1086.0595368170.

The spelling of 1281034720 in words is "one billion, two hundred eighty-one million, thirty-four thousand, seven hundred twenty".