1987885685776 has 15 divisors (see below), whose sum is σ = 3851539443133. Its totient is φ = 993940023040.

The previous prime is 1987885685759. The next prime is 1987885685789. The reversal of 1987885685776 is 6775865887891.

The square root of 1987885685776 is 1409924.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1187934325776 + 799951360000 = 1089924^2 + 894400^2 .

It is a super-3 number, since 3×1987885685776³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1987885685693 and 1987885685702.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5463456 + ... + 5815936.

Almost surely, 2^{1987885685776} is an apocalyptic number.

1987885685776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

1987885685776 is the 1409924-th square number.

It is an amenable number.

1987885685776 is a deficient number, since it is larger than the sum of its proper divisors (1863653757357).

1987885685776 is an frugal number, since it uses more digits than its factorization.

1987885685776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704970 (or 352483 counting only the distinct ones).

The product of its digits is 11379916800, while the sum is 85.

The spelling of 1987885685776 in words is "one trillion, nine hundred eighty-seven billion, eight hundred eighty-five million, six hundred eighty-five thousand, seven hundred seventy-six".