99802170 has 96 divisors (see below), whose sum is σ = 281513232. Its totient is φ = 24385536.

The previous prime is 99802147. The next prime is 99802177. The reversal of 99802170 is 7120899.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 33558849 + 66243321 = 5793^2 + 8139^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (99802177) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 230274 + ... + 230706.

Almost surely, 2^99802170 is an apocalyptic number.

99802170 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 99802170, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140756616).

99802170 is an abundant number, since it is smaller than the sum of its proper divisors (181711062).

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

99802170 is a wasteful number, since it uses less digits than its factorization.

99802170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656 (or 653 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 99802170 is about 9990.1036030664. The cubic root of 99802170 is about 463.8525994589.

The spelling of 99802170 in words is "ninety-nine million, eight hundred two thousand, one hundred seventy".