646301020 has 48 divisors (see below), whose sum is σ = 1415022336. Its totient is φ = 247680000.

The previous prime is 646301011. The next prime is 646301041. The reversal of 646301020 is 20103646.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 646300982 and 646301000.

It is a congruent number.

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, 57460 + ... + 67780.

It is an arithmetic number, because the mean of its divisors is an integer number (29479632).

Almost surely, 2^646301020 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 646301020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (707511168).

646301020 is an abundant number, since it is smaller than the sum of its proper divisors (768721316).

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

646301020 is a wasteful number, since it uses less digits than its factorization.

646301020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10462 (or 10460 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 646301020 is about 25422.4511013395. The cubic root of 646301020 is about 864.5927984151.

Adding to 646301020 its reverse (20103646), we get a palindrome (666404666).

The spelling of 646301020 in words is "six hundred forty-six million, three hundred one thousand, twenty".