678613 has 4 divisors (see below), whose sum is σ = 730828. Its totient is φ = 626400.

The previous prime is 678611. The next prime is 678631. The reversal of 678613 is 316876.

678613 = 582² + 583².

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

It can be written as a sum of positive squares in 2 ways, for example, as 338724 + 339889 = 582^2 + 583^2 .

It is a cyclic number.

It is not a de Polignac number, because 678613 - 2¹ = 678611 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26088 + ... + 26113.

It is an arithmetic number, because the mean of its divisors is an integer number (182707).

2⁶⁷⁸⁶¹³ is an apocalyptic number.

678613 is the 583-rd centered square number.

It is an amenable number.

678613 is a deficient number, since it is larger than the sum of its proper divisors (52215).

678613 is a wasteful number, since it uses less digits than its factorization.

678613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52214.

The product of its digits is 6048, while the sum is 31.

The square root of 678613 is about 823.7797035616. The cubic root of 678613 is about 87.8767644846.

The spelling of 678613 in words is "six hundred seventy-eight thousand, six hundred thirteen".