280040000 has 70 divisors (see below), whose sum is σ = 694507374. Its totient is φ = 112000000.

The previous prime is 280039999. The next prime is 280040009. The reversal of 280040000 is 40082.

It can be written as a sum of positive squares in 5 ways, for example, as 120472576 + 159567424 = 10976^2 + 12632^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280040009) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 36500 + ... + 43500.

Almost surely, 2^280040000 is an apocalyptic number.

280040000 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 280040000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (347253687).

280040000 is an abundant number, since it is smaller than the sum of its proper divisors (414467374).

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

280040000 is an frugal number, since it uses more digits than its factorization.

280040000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7033 (or 7008 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 280040000 is about 16734.3957166072. The cubic root of 280040000 is about 654.2444135668.

Adding to 280040000 its reverse (40082), we get a palindrome (280080082).

The spelling of 280040000 in words is "two hundred eighty million, forty thousand".