679636 has 6 divisors (see below), whose sum is σ = 1189370. Its totient is φ = 339816.

The previous prime is 679633. The next prime is 679639. The reversal of 679636 is 636976.

It is an interprime number because it is at equal distance from previous prime (679633) and next prime (679639).

It can be written as a sum of positive squares in only one way, i.e., 435600 + 244036 = 660^2 + 494^2 .

It is a junction number, because it is equal to n+sod(n) for n = 679595 and 679604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679633) 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 as a sum of consecutive naturals, namely, 84951 + ... + 84958.

2⁶⁷⁹⁶³⁶ is an apocalyptic number.

It is an amenable number.

679636 is a deficient number, since it is larger than the sum of its proper divisors (509734).

679636 is a wasteful number, since it uses less digits than its factorization.

679636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169913 (or 169911 counting only the distinct ones).

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

The square root of 679636 is about 824.4003881610. The cubic root of 679636 is about 87.9208999956.

The spelling of 679636 in words is "six hundred seventy-nine thousand, six hundred thirty-six".