3987208720 has 80 divisors (see below), whose sum is σ = 10137029760. Its totient is φ = 1446451200.

The previous prime is 3987208717. The next prime is 3987208739. The reversal of 3987208720 is 278027893.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 381160 + ... + 391480.

It is an arithmetic number, because the mean of its divisors is an integer number (126712872).

Almost surely, 2^3987208720 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 3987208720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5068514880).

3987208720 is an abundant number, since it is smaller than the sum of its proper divisors (6149821040).

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

3987208720 is a wasteful number, since it uses less digits than its factorization.

3987208720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10784 (or 10778 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 46.

The square root of 3987208720 is about 63144.3482823285. The cubic root of 3987208720 is about 1585.7071708301.

The spelling of 3987208720 in words is "three billion, nine hundred eighty-seven million, two hundred eight thousand, seven hundred twenty".