646086 has 16 divisors (see below), whose sum is σ = 1476864. Its totient is φ = 184584.

The previous prime is 646073. The next prime is 646099. The reversal of 646086 is 680646.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (646073) and next prime (646099).

It is a congruent number.

It is an unprimeable number.

646086 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7650 + ... + 7733.

It is an arithmetic number, because the mean of its divisors is an integer number (92304).

2⁶⁴⁶⁰⁸⁶ is an apocalyptic number.

646086 is an abundant number, since it is smaller than the sum of its proper divisors (830778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646086 is a wasteful number, since it uses less digits than its factorization.

646086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15395.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 646086 is about 803.7947499206. The cubic root of 646086 is about 86.4496906378.

The spelling of 646086 in words is "six hundred forty-six thousand, eighty-six".