1987746017976 has 160 divisors (see below), whose sum is σ = 5814939572640. Its totient is φ = 633191150592.

The previous prime is 1987746017927. The next prime is 1987746017993. The reversal of 1987746017976 is 6797106477891.

1987746017976 is a `hidden beast` number, since 1 + 9 + 8 + 7 + 7 + 4 + 601 + 7 + 9 + 7 + 6 = 666.

It is a super-2 number, since 2×1987746017976² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 16288900 + ... + 16410476.

It is an arithmetic number, because the mean of its divisors is an integer number (36343372329).

Almost surely, 2^{1987746017976} 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 1987746017976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2907469786320).

1987746017976 is an abundant number, since it is smaller than the sum of its proper divisors (3827193554664).

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

1987746017976 is a wasteful number, since it uses less digits than its factorization.

1987746017976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122715 (or 122702 counting only the distinct ones).

The product of its (nonzero) digits is 224042112, while the sum is 72.

The spelling of 1987746017976 in words is "one trillion, nine hundred eighty-seven billion, seven hundred forty-six million, seventeen thousand, nine hundred seventy-six".