3655331220 has 96 divisors (see below), whose sum is σ = 10540252800. Its totient is φ = 945930240.

The previous prime is 3655331213. The next prime is 3655331291. The reversal of 3655331220 is 221335563.

It is a super-2 number, since 2×3655331220² = 26722892655813376800, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 470931 + ... + 478629.

It is an arithmetic number, because the mean of its divisors is an integer number (109794300).

Almost surely, 2^3655331220 is an apocalyptic number.

3655331220 is a gapful number since it is divisible by the number (30) 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 3655331220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5270126400).

3655331220 is an abundant number, since it is smaller than the sum of its proper divisors (6884921580).

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

3655331220 is a wasteful number, since it uses less digits than its factorization.

3655331220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7945 (or 7943 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 30.

The square root of 3655331220 is about 60459.3352593295. The cubic root of 3655331220 is about 1540.4309835511.

Adding to 3655331220 its reverse (221335563), we get a palindrome (3876666783).

The spelling of 3655331220 in words is "three billion, six hundred fifty-five million, three hundred thirty-one thousand, two hundred twenty".