280920000 has 140 divisors (see below), whose sum is σ = 929183816. Its totient is φ = 74880000.

The previous prime is 280919983. The next prime is 280920001. The reversal of 280920000 is 29082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280920001) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 118830 + ... + 121170.

Almost surely, 2^280920000 is an apocalyptic number.

280920000 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 280920000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (464591908).

280920000 is an abundant number, since it is smaller than the sum of its proper divisors (648263816).

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

280920000 is an equidigital number, since it uses as much as digits as its factorization.

280920000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2376 (or 2351 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 280920000 is about 16760.6682444346. The cubic root of 280920000 is about 654.9289979949.

Adding to 280920000 its reverse (29082), we get a palindrome (280949082).

The spelling of 280920000 in words is "two hundred eighty million, nine hundred twenty thousand".