1280578816 has 54 divisors (see below), whose sum is σ = 2809726346. Its totient is φ = 582067200.

The previous prime is 1280578813. The next prime is 1280578837. The reversal of 1280578816 is 6188750821.

It can be written as a sum of positive squares in only one way, i.e., 905769216 + 374809600 = 30096^2 + 19360^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280578813) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10306 + ... + 51646.

Almost surely, 2^1280578816 is an apocalyptic number.

1280578816 is a gapful number since it is divisible by the number (16) 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 1280578816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1404863173).

1280578816 is an abundant number, since it is smaller than the sum of its proper divisors (1529147530).

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

1280578816 is an equidigital number, since it uses as much as digits as its factorization.

1280578816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41379 (or 41354 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 46.

The square root of 1280578816 is about 35785.1759252347. The cubic root of 1280578816 is about 1085.9306832611.

The spelling of 1280578816 in words is "one billion, two hundred eighty million, five hundred seventy-eight thousand, eight hundred sixteen".