646085 has 16 divisors (see below), whose sum is σ = 896832. Its totient is φ = 441600.

The previous prime is 646073. The next prime is 646099. The reversal of 646085 is 580646.

646085 = 121² + 122² + ... + 154².

It is not a de Polignac number, because 646085 - 2¹⁴ = 629701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 646085.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 590 + ... + 1280.

It is an arithmetic number, because the mean of its divisors is an integer number (56052).

2⁶⁴⁶⁰⁸⁵ is an apocalyptic number.

It is an amenable number.

646085 is a deficient number, since it is larger than the sum of its proper divisors (250747).

646085 is a wasteful number, since it uses less digits than its factorization.

646085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 646085 is about 803.7941278711. The cubic root of 646085 is about 86.4496460361.

The spelling of 646085 in words is "six hundred forty-six thousand, eighty-five".