280842040 has 64 divisors (see below), whose sum is σ = 704311200. Its totient is φ = 100159488.

The previous prime is 280842017. The next prime is 280842041. The reversal of 280842040 is 40248082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280842041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2052 + ... + 23788.

Almost surely, 2^280842040 is an apocalyptic number.

280842040 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 280842040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (352155600).

280842040 is an abundant number, since it is smaller than the sum of its proper divisors (423469160).

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

280842040 is a wasteful number, since it uses less digits than its factorization.

280842040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21784 (or 21780 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 28.

The square root of 280842040 is about 16758.3424001302. The cubic root of 280842040 is about 654.8684078048.

The spelling of 280842040 in words is "two hundred eighty million, eight hundred forty-two thousand, forty".