646079 has 4 divisors (see below), whose sum is σ = 738384. Its totient is φ = 553776.

The previous prime is 646073. The next prime is 646099. The reversal of 646079 is 970646.

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-646079 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646073) 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, 46142 + ... + 46155.

It is an arithmetic number, because the mean of its divisors is an integer number (184596).

2⁶⁴⁶⁰⁷⁹ is an apocalyptic number.

646079 is a deficient number, since it is larger than the sum of its proper divisors (92305).

646079 is an equidigital number, since it uses as much as digits as its factorization.

646079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92304.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 646079 is about 803.7903955634. The cubic root of 646079 is about 86.4493784245.

The spelling of 646079 in words is "six hundred forty-six thousand, seventy-nine".