646494108 has 48 divisors (see below), whose sum is σ = 1629936000. Its totient is φ = 198258624.

The previous prime is 646494103. The next prime is 646494113. The reversal of 646494108 is 801494646.

646494108 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (646494103) and next prime (646494113).

It is a self number, because there is not a number n which added to its sum of digits gives 646494108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646494103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41143 + ... + 54641.

It is an arithmetic number, because the mean of its divisors is an integer number (33957000).

Almost surely, 2^646494108 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646494108, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (814968000).

646494108 is an abundant number, since it is smaller than the sum of its proper divisors (983441892).

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

646494108 is a wasteful number, since it uses less digits than its factorization.

646494108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13826 (or 13824 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 646494108 is about 25426.2484059289. The cubic root of 646494108 is about 864.6788913587.

The spelling of 646494108 in words is "six hundred forty-six million, four hundred ninety-four thousand, one hundred eight".