3978887128 has 48 divisors (see below), whose sum is σ = 8336996280. Its totient is φ = 1773847296.

The previous prime is 3978887123. The next prime is 3978887191. The reversal of 3978887128 is 8217888793.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978887123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8575 + ... + 89617.

Almost surely, 2^3978887128 is an apocalyptic number.

3978887128 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

3978887128 is an abundant number, since it is smaller than the sum of its proper divisors (4358109152).

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

3978887128 is a wasteful number, since it uses less digits than its factorization.

3978887128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81104 (or 81081 counting only the distinct ones).

The product of its digits is 10838016, while the sum is 61.

The square root of 3978887128 is about 63078.4204621517. The cubic root of 3978887128 is about 1584.6032407581.

The spelling of 3978887128 in words is "three billion, nine hundred seventy-eight million, eight hundred eighty-seven thousand, one hundred twenty-eight".