676639 has 4 divisors (see below), whose sum is σ = 678424. Its totient is φ = 674856.

The previous prime is 676601. The next prime is 676649. The reversal of 676639 is 936676.

676639 is nontrivially palindromic in base 3.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-676639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 676598 and 676607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (676649) 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, 72 + ... + 1165.

It is an arithmetic number, because the mean of its divisors is an integer number (169606).

2⁶⁷⁶⁶³⁹ is an apocalyptic number.

676639 is a deficient number, since it is larger than the sum of its proper divisors (1785).

676639 is a wasteful number, since it uses less digits than its factorization.

676639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1784.

The product of its digits is 40824, while the sum is 37.

The square root of 676639 is about 822.5806951297. The cubic root of 676639 is about 87.7914742406.

Adding to 676639 its sum of digits (37), we get a palindrome (676676).

The spelling of 676639 in words is "six hundred seventy-six thousand, six hundred thirty-nine".