280678 has 4 divisors (see below), whose sum is σ = 421020. Its totient is φ = 140338.

The previous prime is 280673. The next prime is 280681. The reversal of 280678 is 876082.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280673) 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 as a sum of consecutive naturals, namely, 70168 + ... + 70171.

It is an arithmetic number, because the mean of its divisors is an integer number (105255).

2²⁸⁰⁶⁷⁸ is an apocalyptic number.

280678 is a deficient number, since it is larger than the sum of its proper divisors (140342).

280678 is a wasteful number, since it uses less digits than its factorization.

280678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140341.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 280678 is about 529.7905246416. The cubic root of 280678 is about 65.4740879965.

The spelling of 280678 in words is "two hundred eighty thousand, six hundred seventy-eight".