99987984 has 30 divisors (see below), whose sum is σ = 279827886. Its totient is φ = 33329280.

The previous prime is 99987983. The next prime is 99987991. The reversal of 99987984 is 48978999.

It can be written as a sum of positive squares in only one way, i.e., 76947984 + 23040000 = 8772^2 + 4800^2 .

It is not an unprimeable number, because it can be changed into a prime (99987983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 347037 + ... + 347324.

Almost surely, 2^99987984 is an apocalyptic number.

It is an amenable number.

99987984 is an abundant number, since it is smaller than the sum of its proper divisors (179839902).

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

99987984 is a wasteful number, since it uses less digits than its factorization.

99987984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694375 (or 694366 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 63.

The square root of 99987984 is about 9999.3991819509. The cubic root of 99987984 is about 464.1402915061.

The spelling of 99987984 in words is "ninety-nine million, nine hundred eighty-seven thousand, nine hundred eighty-four".