99988661 has 8 divisors (see below), whose sum is σ = 101689344. Its totient is φ = 98296240.

The previous prime is 99988649. The next prime is 99988753. The reversal of 99988661 is 16688999.

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

It is a cyclic number.

It is not a de Polignac number, because 99988661 - 2⁶ = 99988597 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 99988597 and 99988606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99988261) 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, 25355 + ... + 29031.

It is an arithmetic number, because the mean of its divisors is an integer number (12711168).

Almost surely, 2^99988661 is an apocalyptic number.

It is an amenable number.

99988661 is a deficient number, since it is larger than the sum of its proper divisors (1700683).

99988661 is a wasteful number, since it uses less digits than its factorization.

99988661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4131.

The product of its digits is 1679616, while the sum is 56.

The square root of 99988661 is about 9999.4330339275. The cubic root of 99988661 is about 464.1413390395.

The spelling of 99988661 in words is "ninety-nine million, nine hundred eighty-eight thousand, six hundred sixty-one".