99988555 has 4 divisors (see below), whose sum is σ = 119986272. Its totient is φ = 79990840.

The previous prime is 99988531. The next prime is 99988571. The reversal of 99988555 is 55588999.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55588999 = 23 ⋅2416913.

It is not a de Polignac number, because 99988555 - 2¹¹ = 99986507 is a prime.

It is a super-2 number, since 2×99988555² = 19995422261976050, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 99988555.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9998851 + ... + 9998860.

It is an arithmetic number, because the mean of its divisors is an integer number (29996568).

Almost surely, 2^99988555 is an apocalyptic number.

99988555 is a deficient number, since it is larger than the sum of its proper divisors (19997717).

99988555 is a wasteful number, since it uses less digits than its factorization.

99988555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19997716.

The product of its digits is 5832000, while the sum is 58.

The square root of 99988555 is about 9999.4277336256. The cubic root of 99988555 is about 464.1411750243.

The spelling of 99988555 in words is "ninety-nine million, nine hundred eighty-eight thousand, five hundred fifty-five".