280428826340 has 96 divisors (see below), whose sum is σ = 638978306400. Its totient is φ = 102764077056.

The previous prime is 280428826303. The next prime is 280428826361. The reversal of 280428826340 is 43628824082.

It can be written as a sum of positive squares in 16 ways, for example, as 103234975204 + 177193851136 = 321302^2 + 420944^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67134332 + ... + 67138508.

It is an arithmetic number, because the mean of its divisors is an integer number (6656024025).

Almost surely, 2^280428826340 is an apocalyptic number.

280428826340 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 280428826340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (319489153200).

280428826340 is an abundant number, since it is smaller than the sum of its proper divisors (358549480060).

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

280428826340 is a wasteful number, since it uses less digits than its factorization.

280428826340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6081 (or 6079 counting only the distinct ones).

The product of its (nonzero) digits is 1179648, while the sum is 47.

The spelling of 280428826340 in words is "two hundred eighty billion, four hundred twenty-eight million, eight hundred twenty-six thousand, three hundred forty".