280960420 has 48 divisors (see below), whose sum is σ = 647423280. Its totient is φ = 101776896.

The previous prime is 280960417. The next prime is 280960441. The reversal of 280960420 is 24069082.

It can be written as a sum of positive squares in 8 ways, for example, as 5134756 + 275825664 = 2266^2 + 16608^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3586 + ... + 23974.

It is an arithmetic number, because the mean of its divisors is an integer number (13487985).

Almost surely, 2^280960420 is an apocalyptic number.

280960420 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 280960420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (323711640).

280960420 is an abundant number, since it is smaller than the sum of its proper divisors (366462860).

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

280960420 is a wasteful number, since it uses less digits than its factorization.

280960420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20464 (or 20462 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 280960420 is about 16761.8740002423. The cubic root of 280960420 is about 654.9604078394.

The spelling of 280960420 in words is "two hundred eighty million, nine hundred sixty thousand, four hundred twenty".