3720555220 has 48 divisors (see below), whose sum is σ = 8003096640. Its totient is φ = 1452116736.

The previous prime is 3720555217. The next prime is 3720555221. The reversal of 3720555220 is 225550273.

It is a super-2 number, since 2×3720555220² = 27685062290138496800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3720555221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1230871 + ... + 1233889.

It is an arithmetic number, because the mean of its divisors is an integer number (166731180).

Almost surely, 2^3720555220 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 3720555220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4001548320).

3720555220 is an abundant number, since it is smaller than the sum of its proper divisors (4282541420).

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

3720555220 is a wasteful number, since it uses less digits than its factorization.

3720555220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4504 (or 4502 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 31.

The square root of 3720555220 is about 60996.3541533426. The cubic root of 3720555220 is about 1549.5392622961.

The spelling of 3720555220 in words is "three billion, seven hundred twenty million, five hundred fifty-five thousand, two hundred twenty".