1987184544 has 96 divisors (see below), whose sum is σ = 5546185344. Its totient is φ = 621603840.

The previous prime is 1987184533. The next prime is 1987184561. The reversal of 1987184544 is 4454817891.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

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, 108534 + ... + 125514.

It is an arithmetic number, because the mean of its divisors is an integer number (57772764).

Almost surely, 2^1987184544 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 1987184544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2773092672).

1987184544 is an abundant number, since it is smaller than the sum of its proper divisors (3559000800).

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

1987184544 is a wasteful number, since it uses less digits than its factorization.

1987184544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17070 (or 17062 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 51.

The square root of 1987184544 is about 44577.8481311066. The cubic root of 1987184544 is about 1257.2242043189.

The spelling of 1987184544 in words is "one billion, nine hundred eighty-seven million, one hundred eighty-four thousand, five hundred forty-four".