280740 has 24 divisors (see below), whose sum is σ = 786240. Its totient is φ = 74848.

The previous prime is 280729. The next prime is 280751. The reversal of 280740 is 47082.

It is a happy number.

280740 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (280729) and next prime (280751).

280740 is a modest number, since divided by 740 gives 280 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2280 + ... + 2399.

It is an arithmetic number, because the mean of its divisors is an integer number (32760).

2²⁸⁰⁷⁴⁰ is an apocalyptic number.

280740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280740 is an abundant number, since it is smaller than the sum of its proper divisors (505500).

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

280740 is a wasteful number, since it uses less digits than its factorization.

280740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4691 (or 4689 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 280740 is about 529.8490351034. The cubic root of 280740 is about 65.4789085793.

The spelling of 280740 in words is "two hundred eighty thousand, seven hundred forty".