678369 has 4 divisors (see below), whose sum is σ = 904496. Its totient is φ = 452244.

The previous prime is 678367. The next prime is 678371. The reversal of 678369 is 963876.

678369 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (678367) and next prime (678371).

It is not a de Polignac number, because 678369 - 2¹ = 678367 is a prime.

It is a super-2 number, since 2×678369² = 920369000322, which contains 22 as substring.

It is a D-number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113059 + ... + 113064.

It is an arithmetic number, because the mean of its divisors is an integer number (226124).

2⁶⁷⁸³⁶⁹ is an apocalyptic number.

It is an amenable number.

678369 is a deficient number, since it is larger than the sum of its proper divisors (226127).

678369 is a wasteful number, since it uses less digits than its factorization.

678369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226126.

The product of its digits is 54432, while the sum is 39.

The square root of 678369 is about 823.6315924004. The cubic root of 678369 is about 87.8662309891.

The spelling of 678369 in words is "six hundred seventy-eight thousand, three hundred sixty-nine".