280705020 has 48 divisors (see below), whose sum is σ = 832210848. Its totient is φ = 70451200.

The previous prime is 280705001. The next prime is 280705039. The reversal of 280705020 is 20507082.

It is an interprime number because it is at equal distance from previous prime (280705001) and next prime (280705039).

It is a congruent number.

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, 136581 + ... + 138620.

It is an arithmetic number, because the mean of its divisors is an integer number (17337726).

Almost surely, 2^280705020 is an apocalyptic number.

280705020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280705020 is an abundant number, since it is smaller than the sum of its proper divisors (551505828).

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

280705020 is a wasteful number, since it uses less digits than its factorization.

280705020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275230 (or 275228 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 280705020 is about 16754.2537882175. The cubic root of 280705020 is about 654.7618892484.

The spelling of 280705020 in words is "two hundred eighty million, seven hundred five thousand, twenty".