689278 has 4 divisors (see below), whose sum is σ = 1033920. Its totient is φ = 344638.

The previous prime is 689267. The next prime is 689279. The reversal of 689278 is 872986.

689278 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×689278² = 950208322568, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 689278.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172318 + ... + 172321.

It is an arithmetic number, because the mean of its divisors is an integer number (258480).

2⁶⁸⁹²⁷⁸ is an apocalyptic number.

689278 is a deficient number, since it is larger than the sum of its proper divisors (344642).

689278 is a wasteful number, since it uses less digits than its factorization.

689278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344641.

The product of its digits is 48384, while the sum is 40.

The square root of 689278 is about 830.2276796157. The cubic root of 689278 is about 88.3347272435.

The spelling of 689278 in words is "six hundred eighty-nine thousand, two hundred seventy-eight".