280999680 has 216 divisors, whose sum is σ = 974031408. Its totient is φ = 69009408.

The previous prime is 280999679. The next prime is 280999687. The reversal of 280999680 is 86999082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280999687) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 648744 + ... + 649176.

Almost surely, 2^280999680 is an apocalyptic number.

280999680 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 280999680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (487015704).

280999680 is an abundant number, since it is smaller than the sum of its proper divisors (693031728).

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

280999680 is a wasteful number, since it uses less digits than its factorization.

280999680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483 (or 456 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 51.

The square root of 280999680 is about 16763.0450694377. The cubic root of 280999680 is about 654.9909133794.

The spelling of 280999680 in words is "two hundred eighty million, nine hundred ninety-nine thousand, six hundred eighty".