999011880 has 192 divisors, whose sum is σ = 3412281600. Its totient is φ = 262828800.

The previous prime is 999011879. The next prime is 999011891. The reversal of 999011880 is 88110999.

It is a super-2 number, since 2×999011880² = 1996049472762268800, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 767230 + ... + 768530.

It is an arithmetic number, because the mean of its divisors is an integer number (17772300).

Almost surely, 2^999011880 is an apocalyptic number.

999011880 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 999011880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1706140800).

999011880 is an abundant number, since it is smaller than the sum of its proper divisors (2413269720).

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

999011880 is a wasteful number, since it uses less digits than its factorization.

999011880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406 (or 1390 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 45.

The square root of 999011880 is about 31607.1491912827. The cubic root of 999011880 is about 999.6705181203.

The spelling of 999011880 in words is "nine hundred ninety-nine million, eleven thousand, eight hundred eighty".