999644268 has 192 divisors, whose sum is σ = 2961100800. Its totient is φ = 255897600.

The previous prime is 999644231. The next prime is 999644279. The reversal of 999644268 is 862446999.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4182493 + ... + 4182731.

It is an arithmetic number, because the mean of its divisors is an integer number (15422400).

Almost surely, 2^999644268 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 999644268, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1480550400).

999644268 is an abundant number, since it is smaller than the sum of its proper divisors (1961456532).

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

999644268 is a wasteful number, since it uses less digits than its factorization.

999644268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400 (or 398 counting only the distinct ones).

The product of its digits is 6718464, while the sum is 57.

The square root of 999644268 is about 31617.1514845977. The cubic root of 999644268 is about 999.8814086033.

The spelling of 999644268 in words is "nine hundred ninety-nine million, six hundred forty-four thousand, two hundred sixty-eight".