987191892 has 72 divisors (see below), whose sum is σ = 2653996800. Its totient is φ = 308510208.

The previous prime is 987191879. The next prime is 987191903. The reversal of 987191892 is 298191789.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58909 + ... + 73787.

Almost surely, 2^987191892 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 987191892, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1326998400).

987191892 is an abundant number, since it is smaller than the sum of its proper divisors (1666804908).

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

987191892 is a wasteful number, since it uses less digits than its factorization.

987191892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15005 (or 15000 counting only the distinct ones).

The product of its digits is 653184, while the sum is 54.

The square root of 987191892 is about 31419.6099912141. The cubic root of 987191892 is about 995.7122723342.

The spelling of 987191892 in words is "nine hundred eighty-seven million, one hundred ninety-one thousand, eight hundred ninety-two".