679663 has 4 divisors (see below), whose sum is σ = 683640. Its totient is φ = 675688.

The previous prime is 679639. The next prime is 679669. The reversal of 679663 is 366976.

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

It is a cyclic number.

It is not a de Polignac number, because 679663 - 2¹³ = 671471 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 (679669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1720 + ... + 2077.

It is an arithmetic number, because the mean of its divisors is an integer number (170910).

2⁶⁷⁹⁶⁶³ is an apocalyptic number.

679663 is a deficient number, since it is larger than the sum of its proper divisors (3977).

679663 is a wasteful number, since it uses less digits than its factorization.

679663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3976.

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

The square root of 679663 is about 824.4167635365. The cubic root of 679663 is about 87.9220642623.

It can be divided in two parts, 6796 and 63, that added together give a cube (6859 = 19³).

The spelling of 679663 in words is "six hundred seventy-nine thousand, six hundred sixty-three".