678512 has 10 divisors (see below), whose sum is σ = 1314648. Its totient is φ = 339248.

The previous prime is 678499. The next prime is 678533. The reversal of 678512 is 215876.

It is a congruent number.

It is an unprimeable number.

678512 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 as a sum of consecutive naturals, namely, 21188 + ... + 21219.

2⁶⁷⁸⁵¹² is an apocalyptic number.

It is an amenable number.

678512 is a deficient number, since it is larger than the sum of its proper divisors (636136).

678512 is a wasteful number, since it uses less digits than its factorization.

678512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42415 (or 42409 counting only the distinct ones).

The product of its digits is 3360, while the sum is 29.

The square root of 678512 is about 823.7183984834. The cubic root of 678512 is about 87.8724046145.

The spelling of 678512 in words is "six hundred seventy-eight thousand, five hundred twelve".