280641 has 8 divisors (see below), whose sum is σ = 377440. Its totient is φ = 185472.

The previous prime is 280639. The next prime is 280673. The reversal of 280641 is 146082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 280641 - 2¹ = 280639 is a prime.

It is a d-powerful number, because it can be written as 2⁷ + 8³ + 6⁷ + 0 + 4³ + 1 .

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280641.

It is not an unprimeable number, because it can be changed into a prime (280681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81 + ... + 753.

It is an arithmetic number, because the mean of its divisors is an integer number (47180).

2²⁸⁰⁶⁴¹ is an apocalyptic number.

It is an amenable number.

280641 is a deficient number, since it is larger than the sum of its proper divisors (96799).

280641 is a wasteful number, since it uses less digits than its factorization.

280641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 815.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 280641 is about 529.7556040289. The cubic root of 280641 is about 65.4712108589.

The spelling of 280641 in words is "two hundred eighty thousand, six hundred forty-one".