999165888 has 448 divisors, whose sum is σ = 3669304320. Its totient is φ = 260112384.

The previous prime is 999165883. The next prime is 999165899. The reversal of 999165888 is 888561999.

999165888 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (448).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999165883) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8842120 + ... + 8842232.

Almost surely, 2^999165888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999165888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1834652160).

999165888 is an abundant number, since it is smaller than the sum of its proper divisors (2670138432).

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

999165888 is a wasteful number, since it uses less digits than its factorization.

999165888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201 (or 185 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 63.

The square root of 999165888 is about 31609.5853816528. The cubic root of 999165888 is about 999.7218853261.

The spelling of 999165888 in words is "nine hundred ninety-nine million, one hundred sixty-five thousand, eight hundred eighty-eight".