280247040 has 432 divisors, whose sum is σ = 1084775328. Its totient is φ = 69009408.

The previous prime is 280247021. The next prime is 280247047. The reversal of 280247040 is 40742082.

It is a tau number, because it is divible by the number of its divisors (432).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 280246995 and 280247013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280247047) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5287654 + ... + 5287706.

It is an arithmetic number, because the mean of its divisors is an integer number (2511054).

Almost surely, 2^280247040 is an apocalyptic number.

280247040 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 280247040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (542387664).

280247040 is an abundant number, since it is smaller than the sum of its proper divisors (804528288).

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

280247040 is an equidigital number, since it uses as much as digits as its factorization.

280247040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106 (or 80 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 280247040 is about 16740.5806350915. The cubic root of 280247040 is about 654.4056064863.

The spelling of 280247040 in words is "two hundred eighty million, two hundred forty-seven thousand, forty".