3985278920 has 64 divisors (see below), whose sum is σ = 10254280320. Its totient is φ = 1365525504.

The previous prime is 3985278911. The next prime is 3985278929. The reversal of 3985278920 is 298725893.

3985278920 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 (3985278911) and next prime (3985278929).

It is not an unprimeable number, because it can be changed into a prime (3985278929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 579824 + ... + 586656.

It is an arithmetic number, because the mean of its divisors is an integer number (160223130).

Almost surely, 2^3985278920 is an apocalyptic number.

It is an amenable number.

3985278920 is an abundant number, since it is smaller than the sum of its proper divisors (6269001400).

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

3985278920 is a wasteful number, since it uses less digits than its factorization.

3985278920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8934 (or 8930 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 53.

The square root of 3985278920 is about 63129.0655720485. The cubic root of 3985278920 is about 1585.4513033181.

The spelling of 3985278920 in words is "three billion, nine hundred eighty-five million, two hundred seventy-eight thousand, nine hundred twenty".