678481 has 2 divisors, whose sum is σ = 678482. Its totient is φ = 678480.

The previous prime is 678479. The next prime is 678493. The reversal of 678481 is 184876.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 576081 + 102400 = 759^2 + 320^2 .

It is a cyclic number.

It is not a de Polignac number, because 678481 - 2¹ = 678479 is a prime.

It is a super-2 number, since 2×678481² = 920672934722, which contains 22 as substring.

Together with 678479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (678401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339240 + 339241.

It is an arithmetic number, because the mean of its divisors is an integer number (339241).

2⁶⁷⁸⁴⁸¹ is an apocalyptic number.

It is an amenable number.

678481 is a deficient number, since it is larger than the sum of its proper divisors (1).

678481 is an equidigital number, since it uses as much as digits as its factorization.

678481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 34.

The square root of 678481 is about 823.6995811581. The cubic root of 678481 is about 87.8710663498.

It can be divided in two parts, 6 and 78481, that added together give a palindrome (78487).

The spelling of 678481 in words is "six hundred seventy-eight thousand, four hundred eighty-one".