3720555720 has 512 divisors, whose sum is σ = 14918860800. Its totient is φ = 806962176.

The previous prime is 3720555719. The next prime is 3720555721. The reversal of 3720555720 is 275550273.

It is a happy number.

3720555720 is a `hidden beast` number, since 37 + 2 + 0 + 55 + 572 + 0 = 666.

3720555720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (3720555719) and next prime (3720555721).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (3720555721) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 13146699 + ... + 13146981.

It is an arithmetic number, because the mean of its divisors is an integer number (29138400).

Almost surely, 2^3720555720 is an apocalyptic number.

3720555720 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 3720555720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7459430400).

3720555720 is an abundant number, since it is smaller than the sum of its proper divisors (11198305080).

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

3720555720 is a wasteful number, since it uses less digits than its factorization.

3720555720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394 (or 384 counting only the distinct ones).

The product of its (nonzero) digits is 73500, while the sum is 36.

The square root of 3720555720 is about 60996.3582519481. The cubic root of 3720555720 is about 1549.5393317096.

The spelling of 3720555720 in words is "three billion, seven hundred twenty million, five hundred fifty-five thousand, seven hundred twenty".