987990144 has 64 divisors (see below), whose sum is σ = 2630490240. Its totient is φ = 328559616.

The previous prime is 987990109. The next prime is 987990151. The reversal of 987990144 is 441099789.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×987990144² = 1952249049282281472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175014 + ... + 180570.

It is an arithmetic number, because the mean of its divisors is an integer number (41101410).

Almost surely, 2^987990144 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 987990144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1315245120).

987990144 is an abundant number, since it is smaller than the sum of its proper divisors (1642500096).

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

987990144 is a wasteful number, since it uses less digits than its factorization.

987990144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6037 (or 6025 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 51.

The square root of 987990144 is about 31432.3105100468. The cubic root of 987990144 is about 995.9805805797.

The spelling of 987990144 in words is "nine hundred eighty-seven million, nine hundred ninety thousand, one hundred forty-four".