678988 has 12 divisors (see below), whose sum is σ = 1195600. Its totient is φ = 337392.

The previous prime is 678971. The next prime is 678989. The reversal of 678988 is 889876.

It is a super-2 number, since 2×678988² = 922049408288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (678989) 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, 370 + ... + 1222.

2⁶⁷⁸⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

678988 is a deficient number, since it is larger than the sum of its proper divisors (516612).

678988 is a wasteful number, since it uses less digits than its factorization.

678988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056 (or 1054 counting only the distinct ones).

The product of its digits is 193536, while the sum is 46.

The square root of 678988 is about 824.0072815212. The cubic root of 678988 is about 87.8929483373.

The spelling of 678988 in words is "six hundred seventy-eight thousand, nine hundred eighty-eight".