999109080 has 208 divisors, whose sum is σ = 3443735520. Its totient is φ = 260760384.

The previous prime is 999109061. The next prime is 999109087. The reversal of 999109080 is 80901999.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999109087) by changing a digit.

It is a polite number, since it can be written in 51 ways as a sum of consecutive naturals, for example, 21257617 + ... + 21257663.

Almost surely, 2^999109080 is an apocalyptic number.

999109080 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999109080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1721867760).

999109080 is an abundant number, since it is smaller than the sum of its proper divisors (2444626440).

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

999109080 is an frugal number, since it uses more digits than its factorization.

999109080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94 (or 57 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 999109080 is about 31608.6867806937. The cubic root of 999109080 is about 999.7029384298.

The spelling of 999109080 in words is "nine hundred ninety-nine million, one hundred nine thousand, eighty".