3987864723128 has 64 divisors (see below), whose sum is σ = 8802062640000. Its totient is φ = 1669876548480.

The previous prime is 3987864723097. The next prime is 3987864723179. The reversal of 3987864723128 is 8213274687893.

It is a congruent number.

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, 2922026 + ... + 4063737.

It is an arithmetic number, because the mean of its divisors is an integer number (137532228750).

Almost surely, 2^{3987864723128} is an apocalyptic number.

It is an amenable number.

3987864723128 is an abundant number, since it is smaller than the sum of its proper divisors (4814197916872).

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

3987864723128 is a wasteful number, since it uses less digits than its factorization.

3987864723128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6986292 (or 6986288 counting only the distinct ones).

The product of its digits is 195084288, while the sum is 68.

The spelling of 3987864723128 in words is "three trillion, nine hundred eighty-seven billion, eight hundred sixty-four million, seven hundred twenty-three thousand, one hundred twenty-eight".