99919170 has 96 divisors (see below), whose sum is σ = 290227392. Its totient is φ = 24587712.

The previous prime is 99919147. The next prime is 99919187. The reversal of 99919170 is 7191999.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 30009 + ... + 33171.

It is an arithmetic number, because the mean of its divisors is an integer number (3023202).

Almost surely, 2^99919170 is an apocalyptic number.

99919170 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 99919170, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145113696).

99919170 is an abundant number, since it is smaller than the sum of its proper divisors (190308222).

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

99919170 is a wasteful number, since it uses less digits than its factorization.

99919170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3198 (or 3186 counting only the distinct ones).

The product of its (nonzero) digits is 45927, while the sum is 45.

The square root of 99919170 is about 9995.9576829837. The cubic root of 99919170 is about 464.0337897757.

The spelling of 99919170 in words is "ninety-nine million, nine hundred nineteen thousand, one hundred seventy".