678396 has 12 divisors (see below), whose sum is σ = 1582952. Its totient is φ = 226128.

The previous prime is 678383. The next prime is 678401. The reversal of 678396 is 693876.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×678396² = 920442265632, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

678396 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28255 + ... + 28278.

2⁶⁷⁸³⁹⁶ is an apocalyptic number.

It is an amenable number.

678396 is an abundant number, since it is smaller than the sum of its proper divisors (904556).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

678396 is a wasteful number, since it uses less digits than its factorization.

678396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56540 (or 56538 counting only the distinct ones).

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

The square root of 678396 is about 823.6479830607. The cubic root of 678396 is about 87.8673967051.

The spelling of 678396 in words is "six hundred seventy-eight thousand, three hundred ninety-six".