280715 has 8 divisors (see below), whose sum is σ = 351648. Its totient is φ = 214720.

The previous prime is 280711. The next prime is 280717. The reversal of 280715 is 517082.

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

It is not a de Polignac number, because 280715 - 2² = 280711 is a prime.

It is a super-2 number, since 2×280715² = 157601822450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a plaindrome in base 16.

It is a nialpdrome in base 14.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280715.

It is not an unprimeable number, because it can be changed into a prime (280711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1106 + ... + 1335.

It is an arithmetic number, because the mean of its divisors is an integer number (43956).

2²⁸⁰⁷¹⁵ is an apocalyptic number.

280715 is a deficient number, since it is larger than the sum of its proper divisors (70933).

280715 is a wasteful number, since it uses less digits than its factorization.

280715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2469.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 280715 is about 529.8254429527. The cubic root of 280715 is about 65.4769648813.

Adding to 280715 its reverse (517082), we get a palindrome (797797).

The spelling of 280715 in words is "two hundred eighty thousand, seven hundred fifteen".