678992 has 10 divisors (see below), whose sum is σ = 1315578. Its totient is φ = 339488.

The previous prime is 678989. The next prime is 679033. The reversal of 678992 is 299876.

It can be written as a sum of positive squares in only one way, i.e., 678976 + 16 = 824^2 + 4^2 .

It is a super-2 number, since 2×678992² = 922060272128, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 678992.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21203 + ... + 21234.

2⁶⁷⁸⁹⁹² is an apocalyptic number.

It is an amenable number.

678992 is a deficient number, since it is larger than the sum of its proper divisors (636586).

678992 is a wasteful number, since it uses less digits than its factorization.

678992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42445 (or 42439 counting only the distinct ones).

The product of its digits is 54432, while the sum is 41.

The square root of 678992 is about 824.0097086807. The cubic root of 678992 is about 87.8931209329.

The spelling of 678992 in words is "six hundred seventy-eight thousand, nine hundred ninety-two".