4640220 has 96 divisors (see below), whose sum is σ = 15570240. Its totient is φ = 1140480.

The previous prime is 4640213. The next prime is 4640221. The reversal of 4640220 is 220464.

4640220 is a `hidden beast` number, since 4 + 640 + 2 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 4640193 and 4640202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4640221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6690 + ... + 7350.

It is an arithmetic number, because the mean of its divisors is an integer number (162190).

Almost surely, 2^4640220 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 4640220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7785120).

4640220 is an abundant number, since it is smaller than the sum of its proper divisors (10930020).

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

4640220 is a wasteful number, since it uses less digits than its factorization.

4640220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692 (or 684 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 4640220 is about 2154.1169884665. The cubic root of 4640220 is about 166.7936543313.

Adding to 4640220 its reverse (220464), we get a palindrome (4860684).

The spelling of 4640220 in words is "four million, six hundred forty thousand, two hundred twenty".