1280001320 has 64 divisors (see below), whose sum is σ = 3110123520. Its totient is φ = 471308544.

The previous prime is 1280001319. The next prime is 1280001323. The reversal of 1280001320 is 231000821.

1280001320 is a modest number, since divided by 1320 gives 1280 as remainder.

It is not an unprimeable number, because it can be changed into a prime (1280001323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195947 + ... + 202373.

It is an arithmetic number, because the mean of its divisors is an integer number (48595680).

Almost surely, 2^1280001320 is an apocalyptic number.

1280001320 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 1280001320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1555061760).

1280001320 is an abundant number, since it is smaller than the sum of its proper divisors (1830122200).

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

1280001320 is a wasteful number, since it uses less digits than its factorization.

1280001320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6834 (or 6830 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1280001320 is about 35777.1060875527. The cubic root of 1280001320 is about 1085.7674198703.

The spelling of 1280001320 in words is "one billion, two hundred eighty million, one thousand, three hundred twenty".