646024022220 has 96 divisors (see below), whose sum is σ = 1834274715840. Its totient is φ = 169854935040.

The previous prime is 646024022191. The next prime is 646024022221. The reversal of 646024022220 is 22220420646.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (646024022221) 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, 13593700 + ... + 13641140.

It is an arithmetic number, because the mean of its divisors is an integer number (19107028290).

Almost surely, 2^646024022220 is an apocalyptic number.

646024022220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646024022220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (917137357920).

646024022220 is an abundant number, since it is smaller than the sum of its proper divisors (1188250693620).

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

646024022220 is a wasteful number, since it uses less digits than its factorization.

646024022220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50635 (or 50633 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

Adding to 646024022220 its reverse (22220420646), we get a palindrome (668244442866).

The spelling of 646024022220 in words is "six hundred forty-six billion, twenty-four million, twenty-two thousand, two hundred twenty".