99181290 has 64 divisors (see below), whose sum is σ = 267515136. Its totient is φ = 23350272.

The previous prime is 99181259. The next prime is 99181309. The reversal of 99181290 is 9218199.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3442 + ... + 14498.

It is an arithmetic number, because the mean of its divisors is an integer number (4179924).

Almost surely, 2^99181290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99181290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133757568).

99181290 is an abundant number, since it is smaller than the sum of its proper divisors (168333846).

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

99181290 is a wasteful number, since it uses less digits than its factorization.

99181290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11103.

The product of its (nonzero) digits is 11664, while the sum is 39.

The square root of 99181290 is about 9958.9803694957. The cubic root of 99181290 is about 462.8887056067. Note that the first 3 decimals are identical.

The spelling of 99181290 in words is "ninety-nine million, one hundred eighty-one thousand, two hundred ninety".