678242 has 4 divisors (see below), whose sum is σ = 1017366. Its totient is φ = 339120.

The previous prime is 678229. The next prime is 678253. The reversal of 678242 is 242876.

678242 is nontrivially palindromic in base 8.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 502681 + 175561 = 709^2 + 419^2 .

It is an unprimeable number.

678242 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, 169559 + ... + 169562.

2⁶⁷⁸²⁴² is an apocalyptic number.

678242 is a deficient number, since it is larger than the sum of its proper divisors (339124).

678242 is a wasteful number, since it uses less digits than its factorization.

678242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339123.

The product of its digits is 5376, while the sum is 29.

The square root of 678242 is about 823.5544912148. The cubic root of 678242 is about 87.8607473915.

The spelling of 678242 in words is "six hundred seventy-eight thousand, two hundred forty-two".