1280822144 has 64 divisors (see below), whose sum is σ = 2946420960. Its totient is φ = 543227904.

The previous prime is 1280822111. The next prime is 1280822159. The reversal of 1280822144 is 4412280821.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 1280822144.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79544 + ... + 94280.

Almost surely, 2^1280822144 is an apocalyptic number.

1280822144 is a gapful number since it is divisible by the number (14) 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 1280822144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1473210480).

1280822144 is an abundant number, since it is smaller than the sum of its proper divisors (1665598816).

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

1280822144 is an equidigital number, since it uses as much as digits as its factorization.

1280822144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14855 (or 14843 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 32.

The square root of 1280822144 is about 35788.5756073080. The cubic root of 1280822144 is about 1085.9994596101. Note that the first 3 decimals are identical.

The spelling of 1280822144 in words is "one billion, two hundred eighty million, eight hundred twenty-two thousand, one hundred forty-four".