646106286 has 64 divisors (see below), whose sum is σ = 1581004800. Its totient is φ = 171909216.

The previous prime is 646106281. The next prime is 646106303. The reversal of 646106286 is 682601646.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646106281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40221 + ... + 53943.

It is an arithmetic number, because the mean of its divisors is an integer number (24703200).

Almost surely, 2^646106286 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646106286, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (790502400).

646106286 is an abundant number, since it is smaller than the sum of its proper divisors (934898514).

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

646106286 is a wasteful number, since it uses less digits than its factorization.

646106286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13813.

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 646106286 is about 25418.6208516513. The cubic root of 646106286 is about 864.5059541937.

The spelling of 646106286 in words is "six hundred forty-six million, one hundred six thousand, two hundred eighty-six".