679641 has 4 divisors (see below), whose sum is σ = 906192. Its totient is φ = 453092.

The previous prime is 679639. The next prime is 679669. The reversal of 679641 is 146976.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 679641 - 2¹ = 679639 is a prime.

It is a D-number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (679681) 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, 113271 + ... + 113276.

It is an arithmetic number, because the mean of its divisors is an integer number (226548).

2⁶⁷⁹⁶⁴¹ is an apocalyptic number.

It is an amenable number.

679641 is a deficient number, since it is larger than the sum of its proper divisors (226551).

679641 is a wasteful number, since it uses less digits than its factorization.

679641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226550.

The product of its digits is 9072, while the sum is 33.

The square root of 679641 is about 824.4034206625. The cubic root of 679641 is about 87.9211156028.

The spelling of 679641 in words is "six hundred seventy-nine thousand, six hundred forty-one".