646013316 has 72 divisors (see below), whose sum is σ = 1647263520. Its totient is φ = 196944384.

The previous prime is 646013293. The next prime is 646013317. The reversal of 646013316 is 613310646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646013317) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 227755 + ... + 230573.

It is an arithmetic number, because the mean of its divisors is an integer number (22878660).

Almost surely, 2^646013316 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 646013316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (823631760).

646013316 is an abundant number, since it is smaller than the sum of its proper divisors (1001250204).

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

646013316 is a wasteful number, since it uses less digits than its factorization.

646013316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2965 (or 2950 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 646013316 is about 25416.7920084341. The cubic root of 646013316 is about 864.4644868295.

The spelling of 646013316 in words is "six hundred forty-six million, thirteen thousand, three hundred sixteen".