1280522880 has 576 divisors, whose sum is σ = 5555277000. Its totient is φ = 269402112.

The previous prime is 1280522851. The next prime is 1280522891. The reversal of 1280522880 is 882250821.

It is a happy number.

1280522880 is a `hidden beast` number, since 128 + 0 + 522 + 8 + 8 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 945193536 + 335329344 = 30744^2 + 18312^2 .

It is a tau number, because it is divible by the number of its divisors (576).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3668946 + ... + 3669294.

Almost surely, 2^1280522880 is an apocalyptic number.

1280522880 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 1280522880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2777638500).

1280522880 is an abundant number, since it is smaller than the sum of its proper divisors (4274754120).

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

1280522880 is a wasteful number, since it uses less digits than its factorization.

1280522880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401 (or 379 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 1280522880 is about 35784.3943640241. The cubic root of 1280522880 is about 1085.9148717904.

The spelling of 1280522880 in words is "one billion, two hundred eighty million, five hundred twenty-two thousand, eight hundred eighty".