280887420 has 96 divisors (see below), whose sum is σ = 862477056. Its totient is φ = 67737600.

The previous prime is 280887407. The next prime is 280887457. The reversal of 280887420 is 24788082.

280887420 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 138252 + ... + 140268.

It is an arithmetic number, because the mean of its divisors is an integer number (8984136).

Almost surely, 2^280887420 is an apocalyptic number.

280887420 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 280887420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (431238528).

280887420 is an abundant number, since it is smaller than the sum of its proper divisors (581589636).

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

280887420 is a wasteful number, since it uses less digits than its factorization.

280887420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2251 (or 2249 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 39.

The square root of 280887420 is about 16759.6962979644. The cubic root of 280887420 is about 654.9036783170.

The spelling of 280887420 in words is "two hundred eighty million, eight hundred eighty-seven thousand, four hundred twenty".