280578401280 has 660 divisors, whose sum is σ = 1068512801268. Its totient is φ = 70389596160.

The previous prime is 280578401237. The next prime is 280578401287. The reversal of 280578401280 is 82104875082.

It is a happy number.

280578401280 is a `hidden beast` number, since 28 + 0 + 578 + 40 + 12 + 8 + 0 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 24817591296 + 255760809984 = 157536^2 + 505728^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (280578401287) by changing a digit.

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 59 ways as a sum of consecutive naturals, for example, 119852910 + ... + 119855250.

Almost surely, 2^280578401280 is an apocalyptic number.

280578401280 is a gapful number since it is divisible by the number (20) 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 280578401280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (534256400634).

280578401280 is an abundant number, since it is smaller than the sum of its proper divisors (787934399988).

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

280578401280 is a wasteful number, since it uses less digits than its factorization.

280578401280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2412 (or 2368 counting only the distinct ones).

The product of its (nonzero) digits is 286720, while the sum is 45.

The spelling of 280578401280 in words is "two hundred eighty billion, five hundred seventy-eight million, four hundred one thousand, two hundred eighty".