987998565 has 8 divisors (see below), whose sum is σ = 1580797728. Its totient is φ = 526932560.

The previous prime is 987998519. The next prime is 987998567. The reversal of 987998565 is 565899789.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 987998565 - 2¹³ = 987990373 is a prime.

It is a super-2 number, since 2×987998565² = 1952282328884118450, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 987998496 and 987998505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987998567) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 32933271 + ... + 32933300.

It is an arithmetic number, because the mean of its divisors is an integer number (197599716).

Almost surely, 2^987998565 is an apocalyptic number.

It is an amenable number.

987998565 is a deficient number, since it is larger than the sum of its proper divisors (592799163).

987998565 is a wasteful number, since it uses less digits than its factorization.

987998565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65866579.

The product of its digits is 48988800, while the sum is 66.

The square root of 987998565 is about 31432.4444642793. Note that the first 4 decimals coincide. The cubic root of 987998565 is about 995.9834102735.

The spelling of 987998565 in words is "nine hundred eighty-seven million, nine hundred ninety-eight thousand, five hundred sixty-five".