280308420 has 216 divisors, whose sum is σ = 1007232408. Its totient is φ = 62899200.

The previous prime is 280308419. The next prime is 280308487. The reversal of 280308420 is 24803082.

It can be written as a sum of positive squares in 4 ways, for example, as 2286144 + 278022276 = 1512^2 + 16674^2 .

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, 537760 + ... + 538280.

It is an arithmetic number, because the mean of its divisors is an integer number (4663113).

Almost surely, 2^280308420 is an apocalyptic number.

280308420 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 280308420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (503616204).

280308420 is an abundant number, since it is smaller than the sum of its proper divisors (726923988).

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

280308420 is a wasteful number, since it uses less digits than its factorization.

280308420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611 (or 599 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 280308420 is about 16742.4138044668. The cubic root of 280308420 is about 654.4533791990.

The spelling of 280308420 in words is "two hundred eighty million, three hundred eight thousand, four hundred twenty".