99915558 has 8 divisors (see below), whose sum is σ = 199831128. Its totient is φ = 33305184.

The previous prime is 99915553. The next prime is 99915581. The reversal of 99915558 is 85551999.

It is a happy number.

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

99915558 is an admirable number.

It is a super-3 number, since 3×99915558³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 99915558.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99915553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8326291 + ... + 8326302.

It is an arithmetic number, because the mean of its divisors is an integer number (24978891).

Almost surely, 2^99915558 is an apocalyptic number.

99915558 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

99915558 is a wasteful number, since it uses less digits than its factorization.

99915558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16652598.

The product of its digits is 729000, while the sum is 51.

The square root of 99915558 is about 9995.7770083171. Note that the first 3 decimals coincide. The cubic root of 99915558 is about 464.0281982219.

The spelling of 99915558 in words is "ninety-nine million, nine hundred fifteen thousand, five hundred fifty-eight".