1387511881728 has 224 divisors, whose sum is σ = 4477085426304. Its totient is φ = 373111652352.

The previous prime is 1387511881667. The next prime is 1387511881741. The reversal of 1387511881728 is 8271881157831.

It is a tau number, because it is divible by the number of its divisors (224).

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, 2687326 + ... + 3161762.

Almost surely, 2^{1387511881728} 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 1387511881728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2238542713152).

1387511881728 is an abundant number, since it is smaller than the sum of its proper divisors (3089573544576).

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

1387511881728 is an equidigital number, since it uses as much as digits as its factorization.

1387511881728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474490 (or 474466 counting only the distinct ones).

The product of its digits is 6021120, while the sum is 60.

The spelling of 1387511881728 in words is "one trillion, three hundred eighty-seven billion, five hundred eleven million, eight hundred eighty-one thousand, seven hundred twenty-eight".