280388476560 has 320 divisors, whose sum is σ = 925975019520. Its totient is φ = 69986488320.

The previous prime is 280388476421. The next prime is 280388476561. The reversal of 280388476560 is 65674883082.

It is a happy number.

280388476560 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a self number, because there is not a number n which added to its sum of digits gives 280388476560.

It is not an unprimeable number, because it can be changed into a prime (280388476561) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 162731859 + ... + 162733581.

It is an arithmetic number, because the mean of its divisors is an integer number (2893671936).

Almost surely, 2^280388476560 is an apocalyptic number.

280388476560 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 280388476560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (462987509760).

280388476560 is an abundant number, since it is smaller than the sum of its proper divisors (645586542960).

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

280388476560 is a wasteful number, since it uses less digits than its factorization.

280388476560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2166 (or 2160 counting only the distinct ones).

The product of its (nonzero) digits is 15482880, while the sum is 57.

The spelling of 280388476560 in words is "two hundred eighty billion, three hundred eighty-eight million, four hundred seventy-six thousand, five hundred sixty".